diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/chat/create-chat.dialog.component.ts b/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/chat/create-chat.dialog.component.ts
index 1c74473f..989245ec 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/chat/create-chat.dialog.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/chat/create-chat.dialog.component.ts
@@ -71,6 +71,7 @@ import {
 } from '@ucap-webmessenger/ui';
 import { TranslateService, TranslateParser } from '@ngx-translate/core';
 import { environment } from '../../../../../environments/environment';
+import { StringUtil } from '@ucap-webmessenger/core';
 
 export interface CreateChatDialogData {
   type?: string;
@@ -328,7 +329,7 @@ export class CreateChatDialogComponent implements OnInit, OnDestroy {
         '',
         [
           Validators.required,
-          this.checkSpecialCharacter(),
+          StringUtil.checkSpecialCharacter(),
           this.checkBanWords(),
           this.checkSameName()
         ]
@@ -342,15 +343,6 @@ export class CreateChatDialogComponent implements OnInit, OnDestroy {
     this.currentTabIndex = 0;
   }
 
-  checkSpecialCharacter(): ValidatorFn {
-    return (control: AbstractControl): { [key: string]: any } | null => {
-      const forbidden = /[\{\}\[\]\/?.;:|\)*~`!^+<>@\#$%&\\\=\(\'\"]/g.test(
-        control.value
-      );
-      return forbidden ? { groupName: { value: control.value } } : null;
-    };
-  }
-
   checkBanWords(): ValidatorFn {
     return (control: AbstractControl): { [key: string]: any } | null => {
       if (!control || !control.value) {
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/group/edit-group.dialog.component.html b/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/group/edit-group.dialog.component.html
index 9f89038e..5aa69bde 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/group/edit-group.dialog.component.html
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/group/edit-group.dialog.component.html
@@ -26,6 +26,19 @@
           formControlName="groupName"
         />
         <mat-hint align="end">{{ input.value?.length || 0 }}/20</mat-hint>
+        <mat-error
+          *ngIf="inputForm.get('groupName').hasError('groupNameBanned')"
+        >
+          {{
+            'group.errors.bannedWords'
+              | translate: { bannedWords: bannedWords.join(',') }
+          }}
+        </mat-error>
+        <mat-error
+          *ngIf="inputForm.get('groupName').hasError('groupNameSamed')"
+        >
+          {{ 'group.errors.sameNameExist' | translate }}
+        </mat-error>
       </mat-form-field>
     </form>
   </mat-card-content>
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/group/edit-group.dialog.component.ts b/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/group/edit-group.dialog.component.ts
index 1aa0ec48..efdc229b 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/group/edit-group.dialog.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/group/edit-group.dialog.component.ts
@@ -1,4 +1,4 @@
-import { Component, OnInit, Inject } from '@angular/core';
+import { Component, OnInit, Inject, OnDestroy } from '@angular/core';
 import {
   FormGroup,
   FormBuilder,
@@ -9,6 +9,11 @@ import {
 import { MatDialogRef, MAT_DIALOG_DATA } from '@angular/material';
 import { GroupDetailData } from '@ucap-webmessenger/protocol-sync';
 import { StringUtil } from '@ucap-webmessenger/core';
+import { TranslateService, TranslateParser } from '@ngx-translate/core';
+import { take, tap } from 'rxjs/operators';
+import { Store, select } from '@ngrx/store';
+import { Subscription } from 'rxjs';
+import * as AppStore from '@app/store';
 
 export interface EditGroupDialogData {
   title: string;
@@ -26,23 +31,75 @@ export interface EditGroupDialogResult {
   templateUrl: './edit-group.dialog.component.html',
   styleUrls: ['./edit-group.dialog.component.scss']
 })
-export class EditGroupDialogComponent implements OnInit {
+export class EditGroupDialogComponent implements OnInit, OnDestroy {
   groupName: string;
   inputForm: FormGroup;
 
+  bannedWords: string[] = [];
+  groupListSubscription: Subscription;
+  groupList: GroupDetailData[];
+
   constructor(
+    private store: Store<any>,
     public dialogRef: MatDialogRef<EditGroupDialogData, EditGroupDialogResult>,
     @Inject(MAT_DIALOG_DATA) public data: EditGroupDialogData,
+    private translateService: TranslateService,
+    private translateParser: TranslateParser,
     private formBuilder: FormBuilder
-  ) {}
+  ) {
+    const banKeys: string[] = [
+      'group.nameFavorite',
+      'group.nameMyDept',
+      'group.nameDefault'
+    ];
+
+    const langs = ['ko', 'en'];
+
+    langs.forEach(lang => {
+      this.translateService
+        .getTranslation(lang)
+        .pipe(take(1))
+        .subscribe(
+          translation => {
+            banKeys.forEach(banKey => {
+              this.bannedWords.push(
+                this.translateParser.getValue(translation, banKey)
+              );
+            });
+          },
+          error => {},
+          () => {}
+        );
+    });
+  }
 
   ngOnInit(): void {
     this.inputForm = this.formBuilder.group({
       groupName: [
         this.data.group.name,
-        [Validators.required, StringUtil.checkSpecialCharacter()]
+        [
+          Validators.required,
+          StringUtil.checkSpecialCharacter(),
+          this.checkBanWords(),
+          this.checkSameName()
+        ]
       ]
     });
+
+    this.groupListSubscription = this.store
+      .pipe(
+        select(AppStore.MessengerSelector.SyncSelector.selectAllGroup2),
+        tap(groupList => {
+          this.groupList = groupList;
+        })
+      )
+      .subscribe();
+  }
+
+  ngOnDestroy(): void {
+    if (!!this.groupListSubscription) {
+      this.groupListSubscription.unsubscribe();
+    }
   }
 
   onClickChoice(choice: boolean): void {
@@ -52,4 +109,31 @@ export class EditGroupDialogComponent implements OnInit {
       group: this.data.group
     });
   }
+
+  checkBanWords(): ValidatorFn {
+    return (control: AbstractControl): { [key: string]: any } | null => {
+      if (!control || !control.value) {
+        return null;
+      }
+      const ban =
+        -1 < this.bannedWords.indexOf((control.value as string).trim());
+      return ban ? { groupNameBanned: { value: control.value } } : null;
+    };
+  }
+
+  checkSameName(): ValidatorFn {
+    return (control: AbstractControl): { [key: string]: any } | null => {
+      if (
+        !control ||
+        !control.value ||
+        !this.groupList ||
+        0 === this.groupList.length
+      ) {
+        return null;
+      }
+      const v = (control.value as string).trim();
+      const ban = -1 < this.groupList.findIndex(g => g.name === v);
+      return ban ? { groupNameSamed: { value: control.value } } : null;
+    };
+  }
 }