A real-play sound provider is connected with a communication terminal via a network. The user operates the communication terminal to transmit musical tone files, which include tone pitches and tone-generation timings of designated musical tones, to the real-play sound provider, so that the real-play sound provider controls a prescribed musical instrument to play automatic performance based on musical tone files, thus creating real-play sound files. The real-play sound files are created in accordance with prescribed conditions suiting user's preferences and are stored in a storage device of the real-play sound provider. Then, the real-play sound files are transmitted to the communication terminal upon user's designation of an address (e.g., URL) as necessary. Thus, the communication terminal controls a sound reproduction unit to reproduce sounds of the prescribed musical instrument, which is not possessed and played by the user.