In a content supply system 100, in order to use a streaming server 102 to perform a live distribution, a user PC 106 used makes a reservation for a time zone, etc. to a server reservation control center 101. When the user PC 106 sends desired reservation information to the server reservation control center 101 via the Internet 103, 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 101 to the user PC 106 via the Internet 103. When a distribution request is sent from the user PC 106 to the streaming server 102, authentication processing using this reservation ID is performed.