To control the operation of a user terminal started autonomously or by the user in the case that the user is resident in a restricted area.

This system is a satellite communication system that is provided with a user terminal 44 and a ground segment making communication with the user terminal 44 via a communication satellite 10, measures a position of the user terminal 44 on a surface of the earth 14, judges whether or not the measured position is in existence in an area placing a limit on the operation of the terminal 44 on the surface of the earth 14 so as to allow the user terminal 44 and the ground segment to cooperate with each other in a way of placing a limit on the operation of the user terminal 44 when the user 44 is resident in the area.