diff --git a/adm/sms_admin/ajax.hp_chk.php b/adm/sms_admin/ajax.hp_chk.php
index b0b29ac3d..8fe487d00 100644
--- a/adm/sms_admin/ajax.hp_chk.php
+++ b/adm/sms_admin/ajax.hp_chk.php
@@ -10,7 +10,9 @@ if( !function_exists('json_encode') ) {
     }
 }
 
-auth_check($auth[$sub_menu], "r");
+if( $auth_check = ajax_auth_check($auth[$sub_menu], "r") ){
+    die("{\"error\":\"$auth_check\"}");
+}
 
 $err = '';
 $arr_ajax_msg = array();
diff --git a/adm/sms_admin/ajax.sms_write_form.php b/adm/sms_admin/ajax.sms_write_form.php
index 9a7988129..740ca3c46 100644
--- a/adm/sms_admin/ajax.sms_write_form.php
+++ b/adm/sms_admin/ajax.sms_write_form.php
@@ -10,9 +10,11 @@ if( !function_exists('json_encode') ) {
     }
 }
 
-$page_size = 6;
+if( $auth_check = ajax_auth_check($auth[$sub_menu], "r") ){
+    die("{\"error\":\"$auth_check\"}");
+}
 
-auth_check($auth[$sub_menu], "r");
+$page_size = 6;
 
 if (!$page) $page = 1;
 
diff --git a/adm/sms_admin/ajax.sms_write_level.php b/adm/sms_admin/ajax.sms_write_level.php
index a298b113f..d5521efcc 100644
--- a/adm/sms_admin/ajax.sms_write_level.php
+++ b/adm/sms_admin/ajax.sms_write_level.php
@@ -10,7 +10,9 @@ if( !function_exists('json_encode') ) {
     }
 }
 
-auth_check($auth[$sub_menu], "r");
+if( $auth_check = ajax_auth_check($auth[$sub_menu], "r") ){
+    die("{\"error\":\"$auth_check\"}");
+}
 
 $lev = array();
 
diff --git a/adm/sms_admin/ajax.sms_write_person.php b/adm/sms_admin/ajax.sms_write_person.php
index 686f4a8fa..57c76d126 100644
--- a/adm/sms_admin/ajax.sms_write_person.php
+++ b/adm/sms_admin/ajax.sms_write_person.php
@@ -5,7 +5,9 @@ include_once("./_common.php");
 $page_size = 10;
 $colspan = 5;
 
-auth_check($auth[$sub_menu], "r");
+if( $auth_check = ajax_auth_check($auth[$sub_menu], "r") ){
+    die("{\"error\":\"$auth_check\"}");
+}
 
 $g5['title'] = "휴대폰번호 관리";
 
diff --git a/plugin/sms5/sms5.lib.php b/plugin/sms5/sms5.lib.php
index 7db95a0f6..5185bbb14 100644
--- a/plugin/sms5/sms5.lib.php
+++ b/plugin/sms5/sms5.lib.php
@@ -60,6 +60,30 @@ function sms5_sub_paging($write_pages, $cur_page, $total_page, $url, $add="", $s
         return "";
 }
 
+// 권한 검사
+function ajax_auth_check($auth, $attr)
+{
+    global $is_admin;
+
+    if ($is_admin == 'super') return;
+
+    if (!trim($auth))
+        return '이 메뉴에는 접근 권한이 없습니다.\\n\\n접근 권한은 최고관리자만 부여할 수 있습니다.';
+
+    $attr = strtolower($attr);
+
+    if (!strstr($auth, $attr)) {
+        if ($attr == 'r')
+            return '읽을 권한이 없습니다.';
+        else if ($attr == 'w')
+            return '입력, 추가, 생성, 수정 권한이 없습니다.';
+        else if ($attr == 'd')
+            return '삭제 권한이 없습니다.';
+        else
+            return '속성이 잘못 되었습니다.';
+    }
+}
+
 if ( ! function_exists('array_overlap')) {
     function array_overlap($arr, $val) {
         for ($i=0, $m=count($arr); $i<$m; $i++) {