In this system, an instructor's device for teaching how to operate a personal computer is bidirectionally connected to a student's device for learning how to operate a personal computer, via a communication line of various types. The instructor's device has a personal computer as a lesson device, together with a TV monitor, a terminal, etc. for a videophone. The student's device 3 has a PC 1 as a lesson device, together with a TV monitor, a terminal 34, etc. for a videophone. The instructor and the student have a lesson on the personal computers, together with watching the TV monitors respectively.