PURPOSE: To alternately view and listen to two channels with a switching signal from one operating switch, by providing two storage circuits storing two channel numbers.

CONSTITUTION: A signal representing a channel number from a remote control oscillator 1 is stored in one storage circuit of a storage device 5, and a signal representing a channel number transmitted from the oscillator 1 is stored in another storage circuit of the storage device 5. Every time when a channel switching signal is transmited (a switch provided with the oscillator 1 is operated) from the oscillator 1, an instruction execution circuit 4 switches the output of the two storage circuits of the storage device 5 and applies one of the two channel numbers to a channel selection circuit 6.