A device registration system is a system for registering a terminal device for acquiring and using a content, in a server holding the content. The server holds a content list indicating a content held and a registration list for registering unique information on the terminal device using the content held. The server receives the unique information and transmits the content list to the terminal device. The terminal device accepts selection of a content from the content list by a user input and requests the server to transmit the selected content. When the unique information on the terminal device of the request source is not registered in the registration list, the server performs registration processing and transmits the requested content to the terminal device.