A contents linkage information delivery system for delivering a related content that is associated with another content. The system includes a first playback apparatus, a server for transmitting the related content, and a second playback apparatus for playing back the related content, which each communicate via a communications channel. The first playback apparatus includes a playback position information acquisition unit for acquiring time-base playback position information of the other content, a request input unit for receiving a user request, and a first transmission unit for transmitting the time-base playback position information. The server includes a first reception unit for receiving the time-base playback position information a related content acquisition unit for acquiring the related content based on the time-base playback position information, and a second transmission unit for transmitting the related content. The second playback apparatus includes a second reception unit.