PURPOSE: To output high-definition television signals after converting the signals into NTSC signals by providing a scanning line number converting section which converts MUSE signals into the NTSC signals.

CONSTITUTION: BS-IF signals inputted through an input terminal F are inputted to a selector 9 through an input terminal E after the signals are converted into MUSE signals by means of a BS tuner section 10. The MUSE signals are returned to high-definition television signals by means of a MUSE decoder 1 and outputted to a selector 7. High-definition television signals from the outside are inputted to the selector 7 through an input terminal A and either one of the high-definition television signals is selected by means of a control signal from a control section 4 and outputted to a scanning line number converting section 13. The high-definition television signals are converted into NTSC signals having a different aspect ratio and scanning line number and can be connected to external equipment through an output terminal I.