In order to make a tutor give a remote music lesson to a trainee, the audio-visual station transmits MIDI music data codes/time stamp data codes and click time data codes through a packet switching network and an audio-visual signal, which expresses real images of tutor's hands on the keyboard, and click signal through a teleconference system to another audio-visual station; the controller for the trainee makes the internal clock synchronous with the internal clock for the tutor through the pairing work between the click time data codes and the click signals so that the images of note bars and real images are synchronously produced on a display unit in front of the trainee's keyboard; moreover, while the tutor's exhibition is being carried out, any oral direction does not reach the trainee so that the trainee concentrate himself to the exhibition.