A computerized debate support system has been developed and introduced to the real lecture for the master course students of Graduate School of Energy Science, Kyoto University. The purpose of the system is to foster students¡Çabilities of critical thinking, logical evaluation, problem findings on how to set up rational policies for the promotion of sustainable energy and environment, with the mutual discussion from the versatile aspects. The overall system development with the system functions are first summarized, and the conducted results of classroom education by the system are evaluated for further improvement of the system.