Multiparty conference communication method based on SIP protocol

The invention relates to a multiparty communication technology in the network communication field, and discloses a multiparty communication method based on SIP protocol. The technical scheme is that: a, a terminal requests an IM server to establish an IM multiparty conference; b, a terminal participating in the IM multiparty conference invites other terminals to join in the conference; c, a terminal participating in the IM multiparty conference drives another terminal participating in the IM multiparty conference out of the IM multiparty conference; d, the terminals participating in the IM multiparty conference send an instant message to and receive an instant message from each other; e, the terminals participating in the IM multiparty conference do not comprise an initiator, and exit the conference; f, when the conference initiator exits the conference or all participants of the conference exit the conference, the IM multiparty conference is ended; and g, before the IM multiparty conference is ended, all use