diff --git a/pick-application/src/main/kotlin/com/pickdsm/pickserverspring/domain/user/User.kt b/pick-application/src/main/kotlin/com/pickdsm/pickserverspring/domain/user/User.kt
index f6ab988c..3553830e 100644
--- a/pick-application/src/main/kotlin/com/pickdsm/pickserverspring/domain/user/User.kt
+++ b/pick-application/src/main/kotlin/com/pickdsm/pickserverspring/domain/user/User.kt
@@ -13,4 +13,9 @@ data class User(
     val num: Int,
     val birthDay: LocalDate,
     val profileFileName: String?,
-)
+) {
+    companion object {
+        fun User.processGcn() = "${this.grade}${this.classNum}${this.paddedUserNum()}"
+        private fun User.paddedUserNum(): String = this.num.toString().padStart(2, '0')
+    }
+}