Content acquisition apparatus, content acquisition method and content acquisition program

A non-transitory recording medium storing a program for generating or updating a transfer list which, when executed by a processor of a first device, performs a method comprising:

• receiving, by the first device, a list of requested multimedia items from a second device including a processor of the second device and a memory;
• determining, by the first device, if the requested multimedia items are stored on the first device;
• when it is determined that one or more of the requested multimedia items are not stored on the first device, requesting, by the first device, the one or more of the requested multimedia items from a third device and receiving, by the first device, the one or more of the requested multimedia items from the third device;
• and
• generating or updating, by the first device, the transfer list indicating multimedia items to be sent to the second device,
• wherein the second device comprises:
• a content storage configured to store a first content and a multimedia management list, wherein the multimedia management list includes an identifier of the first content;
• a communication unit configured to transmit the multimedia management list to the first device, and configured to acquire a difference multimedia management list including an identifier of a second content, wherein the identifier of the first content is different from the identifier of the second content;
• and a display unit configured to display the second identifier.

A transfer list updating or generating device, comprising:

• a processor of the transfer list updating or generating device;
• a memory of the transfer list updating or generating device;
• wherein the transfer list updating or generation device is configured to:
• receive, by a first device, a list of requested multimedia items from a second device including a processor of the second device and a memory of the second device,
• determine, by the first device, if the requested multimedia items are stored on the first device,
• when it is determined that one or more of the requested multimedia items are not stored on the first device, request, by the first device, the one or more of the requested multimedia items from a third device and receive, by the first device, the one or more of the requested multimedia items from a the third device, and
• generate or update, by the first device, a transfer list indicating multimedia items to be sent to the second device,
• wherein the second device comprises:
• a content storage configured to store a first content and a multimedia management list, wherein the multimedia management list includes an identifier of the first content;
• a communication unit configured to transmit the multimedia management list to the first device, and configured to acquire a difference multimedia management list including an identifier of a second content, wherein the identifier of the first content is different from the identifier of the second content;
• and a display unit configured to display the second identifier.