RECEPTION TERMINAL AND PROGRAM THEREFOR

PROBLEM TO BE SOLVED: To prevent the occurrence of a packet loss etc. with a saved communication path use band in a multicast distribution system.SOLUTION: When there are two or more servers for distributing broadcast data of a zapping channel to be received by a reception terminal, the reception terminal changes the distribution source server of the zapping channel from a first server to a second server or from the second server to the first server, so as to take part in a multicast group again. Because the reception terminal unifies the distribution source server of the zapping channel, the number of combinations between multicast groups and the servers is minimized, and a use amount of network bands is reduced, and the reception terminal can correctly receive broadcast data.