PROBLEM TO BE SOLVED: To accept simultaneous service by simultaneously receiving a digital audio signal and an analog video audio signal at CATV reception equipment and performing seamless switching between formats. SOLUTION: A tuner 20 coupled to a CATV input 28 is tuned at the carrier frequency of channel selected by a subscriber. The received A/V signal is branched to a digital audio module 24 and an analog signal processing circuit 26 by an IF buffer 22. The processing circuit 26 has all the conventional functions including an IR remote control receiver 31 and outputs an RF signal to an ordinary TV receiver 14. A digital audio receiver 70 outputs a stereo audio signal and supplies it to a selecting switch 24 after performing D/A conversion. The receiver 70 and the analog receiver in the processing circuit 26 mutually communicate and the output volume level of D/A converter 72 and the output level of BTSC decoder 34 inside the TV receiver 14 can be put in order and seamlessly switched. COPYRIGHT: (C)1997,JPO