A portable telephone downloads from the music download center the music data that contain tone color data, tempo data, and a series of note data and rest data with respect to at least a single musical tune. A CPU outputs to an interface the tone color data, and the series of note data and rest data at a tempo designated by the tempo data. The interface converts these data in the prescribed format (e.g., MIDI format), so that the converted data are output to the external playback device (e.g., synthesizer) via a cable or by radio communication.