Abstract: To compound broadcast content and network content and suitably reproduce the two pieces of content concurrently using a data broadcast service. A broadcaster and an application provider, for example, upload AV content related to broadcast content to a server, and deliver a data broadcast application containing a URL link to AV content. Each of selection buttons of a mosaic-type menu contains a URL link to AV content. The broadcaster and the application provider can control what should be a streaming moving picture that a user reproduces concurrently with viewing a program.