When a main television is turned on, a power source A, a power source B, and a power source C operate. When the main television is turned off (stand-by state), the power source A and the power source B operate, if the sub-television is turned on, and only the power source A operates, if the sub-TV is turned off. Therefore, even when the main television is turned off, as long as the sub-television is turned on, a broadcast reception process and a wireless video transmission to the sub-TV are performed. If both the main television and sub-television are turned off, then electric power supplies to circuits for the broadcast reception processes are stopped, and as a result, electric power consumption is saved.