To provide a broadcast system or the like that allows an external device such as a toy to conduct a new function in interlocking with contents of a program as the program progresses.

The broadcast system 1 distributes broadcast program data 3 and program data 5 relating to contents of a program to each consumer 19 from a station 17 via a satellite 9 by using a broadcast transmitter 7. The broadcast program data 3 are transferred from a tuner 15 of each consumer 19 to a display terminal 11, and a main broadcast section 21 displays the broadcast program. The tuner 15 transfers the program data 5 to the display terminal 11 and the external device 13, a data broadcast section 23 displays a data broadcast, and the external device 13 stores a program related to contents of the program.