A code information reading section selects recording codes which are respectively recorded on a plurality of recording media one at a time, and sequentially optically reads the recording codes in order to make it possible to synthesize a plurality of audio information items which are previously coded and recorded in an optically readable form and to simultaneously output them. A code information decoding section sequentially decodes the recording codes read by the code information reading section. A decoded information synthesizing section sequentially synthesizes digital audio signals sequentially decoded by the code information decoding section. A D/A converter converts the digital audio signal synthesized by the decoded information synthesizing section into an analog audio signal. An audio output section outputs the analog audio signal converted by the D/A converter as an audio output.