The invention relates to a method and server for realizing the communication between an application system and a communication network. The method effectively controls the communication between the application system and the communication network by judging the application system and the power limit of the communication means thereof by a proxy server. The management server includes an authentication interface, an authentication information acquisition module and an authentication information maintenance module; the management server can realize the authentication on the proxy server. The proxy server includes an enterprise application interface, a communication network interface, an authentication unit and a business control unit; the proxy server can effectively control the access to the communication network from different application systems in the same enterprise.