To allow many users to efficiently use the functions of a processing server that performs predetermined processing, via a network and also to prevent interference by illegal users. In a content supply system 100, in order to use a streaming server 102 to perform a live distribution, a user PC 106 to be used makes a reservation for a time zone, etc. to a server reservation control center 101. When the reservation is accepted, the user PC 106 sends a reconfirmation (reconfirmation of the reservation) to the server reservation control center 101 by six hours before the distribution start time according to the reservation. If the reconfirmation is not made by six hours before, the server reservation control center 101 cancels the reservation. On the other hand, if the reconfirmation is made by six hours before, the server reservation control center 101 confirms the reservation and carries out billing processing.