Abstract: In an interactive on-line system, a registration management system mounted on a server 10 includes a teaching affairs management system which registers information on teaching subjects, teaching schedules and teachers, and a reservation management system includes a lecture booking system which provides a trainee of the information registered in the teaching affairs management system in an on-line state when the trainee books a lecture and manages the information on the teaching subject, teaching schedule and teacher selected by the trainee. According to the registration management system, the booking state of lectures or the like inputted from the terminal of each user and such service resources as the teaching subject, teaching schedule or the like which can be supplied to users are easily managed.