Multicasting apparatus

[Subject] Offering the multicasting equipment which has a node of a bidirectional network, a node transmits the participation for multicasting sessions, and a secession message to a network. [Solution means] [within the session through the network which has two or more routers in the multicasting tree to the transmission site of a DVB*T network], From one or more servers, multicasting of the IP data is carried out, and this data is encapsulated by IPE and transmitted to an one way to move user equipment. It is directed to IPE that a controller transmits the participating message for creating the schedule of the session data about the session transmitted from a server, and receiving the data of the selected session. The address of a sending agency can be included by the participating message, and before this starts a session, it can be transmitted at the suitable time. [Selection figure] Fig. 4