diff --git a/denops/ddc/context.ts b/denops/ddc/context.ts
index 76776ad..89972dd 100644
--- a/denops/ddc/context.ts
+++ b/denops/ddc/context.ts
@@ -1,8 +1,8 @@
 import type {
   BaseParams,
+  Callback,
   Context,
   ContextBuilder,
-  ContextCallback,
   ContextCallbacks,
   DdcEvent,
   DdcOptions,
@@ -12,7 +12,7 @@ import type {
   UserOptions,
 } from "./types.ts";
 import { defaultSourceOptions } from "./base/source.ts";
-import { printError } from "./utils.ts";
+import { callCallback, printError } from "./utils.ts";
 
 import type { Denops } from "jsr:@denops/std@~7.3.0";
 import * as op from "jsr:@denops/std@~7.3.0/option";
@@ -65,6 +65,7 @@ export function defaultDdcOptions(): DdcOptions {
     ],
     backspaceCompletion: false,
     cmdlineSources: [],
+    dynamicUi: "",
     filterOptions: {},
     filterParams: {},
     hideOnEvents: false,
@@ -204,32 +205,23 @@ class Custom {
     bufnr: number,
     options: UserOptions,
   ): Promise<DdcOptions> {
-    const callContextCallback = async (callback: ContextCallback) => {
-      if (!denops || !callback) {
-        return {};
-      }
-
-      if (is.String(callback)) {
-        if (callback === "") {
-          return {};
-        }
-
-        return await denops.call(
-          "denops#callback#call",
-          callback,
-        ) as Partial<DdcOptions>;
-      } else {
-        return await callback(denops);
-      }
-    };
-
-    const contextGlobal = await callContextCallback(this.context.global);
+    const contextGlobal = await callCallback(
+      denops,
+      this.context.global,
+      {},
+    ) as Partial<DdcOptions | null>;
     const filetype = this.filetype[ft] || {};
-    const contextFiletype = await callContextCallback(
+    const contextFiletype = await callCallback(
+      denops,
       this.context.filetype[ft],
-    );
+      {},
+    ) as Partial<DdcOptions | null>;
     const buffer = this.buffer[bufnr] || {};
-    const contextBuffer = await callContextCallback(this.context.buffer[bufnr]);
+    const contextBuffer = await callCallback(
+      denops,
+      this.context.buffer[bufnr],
+      {},
+    ) as Partial<DdcOptions | null>;
 
     return foldMerge(mergeDdcOptions, defaultDdcOptions, [
       this.global,
@@ -254,15 +246,15 @@ class Custom {
     this.buffer[bufnr] = options;
     return this;
   }
-  setContextGlobal(callback: ContextCallback): Custom {
+  setContextGlobal(callback: Callback): Custom {
     this.context.global = callback;
     return this;
   }
-  setContextFiletype(callback: ContextCallback, ft: string): Custom {
+  setContextFiletype(callback: Callback, ft: string): Custom {
     this.context.filetype[ft] = callback;
     return this;
   }
-  setContextBuffer(callback: ContextCallback, bufnr: number): Custom {
+  setContextBuffer(callback: Callback, bufnr: number): Custom {
     this.context.buffer[bufnr] = callback;
     return this;
   }
@@ -528,13 +520,13 @@ export class ContextBuilderImpl implements ContextBuilder {
   setBuffer(bufnr: number, options: Partial<DdcOptions>) {
     this.#custom.setBuffer(bufnr, options);
   }
-  setContextGlobal(callback: ContextCallback) {
+  setContextGlobal(callback: Callback) {
     this.#custom.setContextGlobal(callback);
   }
-  setContextFiletype(callback: ContextCallback, ft: string) {
+  setContextFiletype(callback: Callback, ft: string) {
     this.#custom.setContextFiletype(callback, ft);
   }
-  setContextBuffer(callback: ContextCallback, bufnr: number) {
+  setContextBuffer(callback: Callback, bufnr: number) {
     this.#custom.setContextBuffer(callback, bufnr);
   }
 
diff --git a/denops/ddc/ddc.ts b/denops/ddc/ddc.ts
index 488ac16..d3dd93f 100644
--- a/denops/ddc/ddc.ts
+++ b/denops/ddc/ddc.ts
@@ -24,6 +24,7 @@ import {
   getSource,
   getUi,
 } from "./ext.ts";
+import { callCallback } from "./utils.ts";
 
 import type { Denops } from "jsr:@denops/std@~7.3.0";
 import * as autocmd from "jsr:@denops/std@~7.3.0/autocmd";
@@ -476,6 +477,14 @@ export class Ddc {
       return;
     }
 
+    const dynamicUi = await callCallback(denops, options.dynamicUi, {
+      completePos,
+      items,
+    }) as string | null;
+    if (dynamicUi) {
+      options.ui = dynamicUi;
+    }
+
     await (async function write(ddc: Ddc) {
       await batch(denops, async (denops: Denops) => {
         await vars.g.set(denops, "ddc#_changedtick", context.changedTick);
diff --git a/denops/ddc/types.ts b/denops/ddc/types.ts
index 8a19f77..b1c0149 100644
--- a/denops/ddc/types.ts
+++ b/denops/ddc/types.ts
@@ -26,14 +26,14 @@ export type Context = {
   nextInput: string;
 };
 
-export type ContextCallback =
+export type Callback =
   | string
-  | ((denops: Denops) => Promise<Partial<DdcOptions>>);
+  | ((denops: Denops, args: Record<string, unknown>) => Promise<unknown>);
 
 export type ContextCallbacks = {
-  global: ContextCallback;
-  filetype: Record<string, ContextCallback>;
-  buffer: Record<number, ContextCallback>;
+  global: Callback;
+  filetype: Record<string, Callback>;
+  buffer: Record<number, Callback>;
 };
 
 export interface ContextBuilder {
@@ -45,9 +45,9 @@ export interface ContextBuilder {
   setGlobal(options: Partial<DdcOptions>): void;
   setFiletype(ft: string, options: Partial<DdcOptions>): void;
   setBuffer(bufnr: number, options: Partial<DdcOptions>): void;
-  setContextGlobal(callback: ContextCallback): void;
-  setContextFiletype(callback: ContextCallback, ft: string): void;
-  setContextBuffer(callback: ContextCallback, bufnr: number): void;
+  setContextGlobal(callback: Callback): void;
+  setContextFiletype(callback: Callback, ft: string): void;
+  setContextBuffer(callback: Callback, bufnr: number): void;
   patchGlobal(options: Partial<DdcOptions>): void;
   patchFiletype(ft: string, options: Partial<DdcOptions>): void;
   patchBuffer(bufnr: number, options: Partial<DdcOptions>): void;
@@ -70,6 +70,7 @@ export type DdcOptions = {
   autoCompleteEvents: DdcEvent[];
   backspaceCompletion: boolean;
   cmdlineSources: UserSource[] | Record<string, UserSource[]>;
+  dynamicUi: Callback;
   filterOptions: Record<FilterName, Partial<FilterOptions>>;
   filterParams: Record<FilterName, Partial<BaseParams>>;
   hideOnEvents: boolean;
diff --git a/denops/ddc/utils.ts b/denops/ddc/utils.ts
index d122c92..b296b23 100644
--- a/denops/ddc/utils.ts
+++ b/denops/ddc/utils.ts
@@ -1,6 +1,9 @@
+import type { Callback } from "./types.ts";
+
 import type { Denops } from "jsr:@denops/std@~7.3.0";
 import * as op from "jsr:@denops/std@~7.3.0/option";
 
+import { is } from "jsr:@core/unknownutil@~4.3.0/is";
 import { assertEquals } from "jsr:@std/assert@~1.0.2/equals";
 
 export async function convertKeywordPattern(
@@ -107,6 +110,30 @@ export async function safeStat(path: string): Promise<Deno.FileInfo | null> {
   return null;
 }
 
+export async function callCallback(
+  denops: Denops | null,
+  callback: Callback,
+  args: Record<string, unknown>,
+): Promise<unknown | null> {
+  if (!denops || !callback) {
+    return null;
+  }
+
+  if (is.String(callback)) {
+    if (callback === "") {
+      return null;
+    }
+
+    return await denops.call(
+      "denops#callback#call",
+      callback,
+      args,
+    );
+  } else {
+    return await callback(denops, args);
+  }
+}
+
 Deno.test("vimoption2ts", () => {
   assertEquals(vimoption2ts("@,48-57,_,\\"), "a-zA-Z0-9_\\\\");
   assertEquals(vimoption2ts("@,-,48-57,_"), "a-zA-Z0-9_-");
diff --git a/doc/ddc.txt b/doc/ddc.txt
index f47e506..9ce132a 100644
--- a/doc/ddc.txt
+++ b/doc/ddc.txt
@@ -143,6 +143,16 @@ cmdlineSources
 		    \ '=': ['input'],
 		    \ })
 <
+                                                        *ddc-option-dynamicUi*
+dynamicUi
+		It is the function which overwrites |ddc-option-ui| after
+		gather items.
+		The function returns new ui name.
+		NOTE: {func} is evaluated after user input and it affects
+		completion performance.
+
+		Default: ""
+
                                                     *ddc-option-filterOptions*
 filterOptions
 		It is a dictionary that maps filter names to its options.
@@ -1710,6 +1720,9 @@ https://github.com/Milly/ddc-unprintable
 ==============================================================================
 COMPATIBILITY                                              *ddc-compatibility*
 
+2024.11.04
+* Change callback function type.
+
 2024.08.30
 * Refactor types.ts.