function execute()
 {
     $context = $this->getContext();
     $controller = $context->getController();
     $request = $context->getRequest();
     $user = $context->getUser();
     // 管理者かどうか確認
     if (!$this->get_execute_privilege()) {
         $controller->forward(SECURE_MODULE, SECURE_ACTION);
         return;
     }
     $acs_user_info_row = $user->getAttribute('acs_user_info_row');
     // get
     $form = $request->ACSGetParameters();
     $ret = ACSSystemAnnounce::delete_system_announce($form['system_announce_id']);
     $system_announce_list_url = $this->getControllerPath('System', 'SystemAnnounceList');
     header("Location: {$system_announce_list_url}");
 }