In a content supply system, in order to use a streaming server to perform a live distribution, a user PC used makes a reservation for a time zone, etc. to a server reservation control center. When the user PC sends desired reservation information to the server reservation control center via the Internet, if the reservation is accepted, a reservation ID only used for authentication of the reservation is created and sent from the server reservation control center to the user PC via the Internet. When a distribution request is sent from the user PC to the streaming server, authentication processing using this reservation ID is performed.