System and method for managing the unicast/multicast conversion for multimedia group communications in a communication network (1) comprising: ✓ At the level of a site (11, 12, 13) and a border router (Ri), • A module for managing presence (22) of the users (Ui) present on a site, • A module for managing groups (23), • A supervision module (21) emitting "uplink" and "downlink" conversion rules, to be applied to the data of an incoming or outgoing stream of a site and intended for one or more users belonging to one and the same communication group Gi, • An intelligent module (20) adapted for applying the conversion rules to the data that it receives before broadcasting them to one or more users (Ui) belonging to the same communication group Gi as the sending user (U1), ✓ At the level of the central network (10), means of multicast transmission (15) of the data from one site to another site.
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