To provide a method for reserving time slots, by which a receiving node can receive a multicast data without errors, and to provide a method of enhancing the spatial efficiency of the reception node or the like.

In the wireless network, in which the multicast data is transmitted and received in at least one reserved time slot, a transmission node presents a method for transferring the multicast data to a recognized reception node. When the multicast data are generated, the transmission node transmits a multicast request message that notifies it to the receiving node and receives a multicast join message, to which a receiving node information is added from the receiving node. The transmission node decides a free slot to be reserved and transmits a multicast reservation request message, to which the information is added to the reception node. The reception node reserves time slots, by transmitting a reservation response message to the transmitting node and receives the multicast data via this.