A wireless audio transmission/reception system is provided. The transmission/reception system includes an FM detector for detecting an occupied channel among radio FM channels, a microprocessor for selecting a using channel that is greatly different in frequency from the detected occupied channel and thus does not interfere therewith, an FM transmitter built in an audio replay system to transmit/receive an audio signal over the using channel, and an external audio system for receiving and outputting the audio signal from the FM transmitter.