PURPOSE: To reproduce a high definition signal by a MUSE decoder and to execute the on-screen display of the channel number of a receiving channel selected by a BS(satellite broadcasting receiving) tuner on the reproducing screen of the high definition signal.

CONSTITUTION: A control signal from a CPU 10 in the BS tuner is inputted to a local oscillation circuit 8, a receiving channel is switched and a receiving channel signal is detected by an FM detecting circuit 6 to demodulate a MUSE signal. A receiving channel identification(ID) signal is outputted from the CPU 10 and superposed to the MUSE signal by a synthesizer 9 to output the synthesized signal. On the other hand, the MUSE decoder 15 is provided with a detector 16 and an on-screen display means (a CPU 18, an on-screen circuit 19, etc.), the detector 16 detects the ID signal and the on-screen display means outputs a character signal corresponding to a detection signal outputted from the detector 16. The character signal is superposed to the high definition signal reproduced by the MUSE decoder 15 and the superposed signal is outputted to execute the on-screen display of the receiving channel number.