Abstract: The present invention discloses an integrated instant message system including gateway functions and a method for implementing the same. In the integrated instant message system, a user is used as a session initiator. The session initiator builds a session for passing instant messages through a network medium. In the session, the session initiator is used as a gateway in order to invite other clients in networks to join in the session. Because the session initiator provides other instant message functions, it accepts connections from the users of other instant message systems in order to integrate the clients of different instant message systems in the session.