To provide a service which never makes a user lose interest, and to increase an information distribution efficiency even when there is no or little information related with the user.

When content to be displayed in a list with first priority is displayed in a list to clients 31 and 32, a server 22 decides whether or not any space for one or more tags is generated, and when deciding that any space is generated, the server 22 prepares list display information including the tag of the content whose list display should be given a higher priority than the first priority, and when deciding that any space is not generated, the server 22 prepares list display information excluding the tag of the content whose list display should be given a lower priority than the first priority, and distributes the list display information to the clients 31 and 32, and the clients 31 and 32 display the list display information, and request content to the server 22 from the tag in the list display information, and the server 22 distributes the content requested form the client to the clients 31 and 32.