In a content live distribution, to notify people who are wanted to see the content that the contents live distribution will be performed, without the need for the content provider to carry out any troublesome operations. In a content supply system, a provider uses a streaming server to perform live distribution and makes a reservation for the use of a time zone, etc. to a server reservation control center with a user PC. In the case where the user PC sends desired reservation information including e-mail addresses of people who are wanted to see the content, to the server reservation control center over the Internet, when the reservation is permitted, the server reservation control center sends an e-mail notifying that a content distribution will be performed to each e-mail address.