To efficiently distribute and transmit, in real time, a media packet to a plurality of terminals in accordance with data communication environments of terminals.

In a transmission terminal 1A, based on address information about terminals 2A-2F participated in relevant media communication and a connection speed to a WAN 3, route information is generated that indicates a distribution route of the media packet between terminals 1A, 2A-2F, and the route information is stored in each media packet and transmitted to a reception terminal that becomes a distribution destination. In reception terminals 2A-2F that receive and play back media packets, the media data stored in the received media packet are played back and the relevant media packet is transferred to the distribution destination terminal designated by the route information stored in the relevant media packet.