Abstract: The invention provides a technical solution for instant messaging among multiple members of an instant messenger group. An instant messenger group server is independent of an instant messenger server. At least one group identification and a member list of each group identified by the corresponding group identification are prestored in the group server. The instant messenger group server logs in to the instant messenger server as an instant messenger client, using each of said at least one group identification as an instant messenger identification, and receives instant messages sent by an instant messenger client and sends the instant messages respectively to each of the instant messenger clients corresponding to the instant messenger identifications of other members the instant messenger server. Since the instant messenger group server is independent of the instant messenger server, the instant messenger group server can support multiple instant messenger platforms.