A monitoring system includes a schedule storage unit configured to store schedule information in association with a set of face identification information for identifying facial images of at least two or more users and period information indicating a period in which the two or more users use an information processing device, an imaging unit configured to capture an image of users using the information processing device, a user determination unit configured to determine whether all users corresponding to the set of face identification information stored in association with the period information match users included in the captured image in the period indicated by the period information on the basis of the captured image captured by the imaging unit and the schedule information stored in the schedule storage unit, and a use control unit configured to control whether to permit use of the information processing device on the basis of a determination result determined by the user determination unit.