To integrate both the OSI network and the TCP/IP internet the application gateway with powerful and flexible paradigms has been used, but micro-managements of the gateway produces high communication costs and long delays in responding to critical situations. The mechanism that maps the access control policy is needed between two domains using different security policies. These problems are caused by managing each domain with different standards. In this paper, we propose an application gateway that delegates powerful and complex services of the CMIP as well as management functions sent to an agent by a manager in order to reduce network management costs and delays. We also suggest a security mechanism converting the security policy in order to guarantee safe communication between two domains