1. A transmission apparatus comprising: a communication unit configured to transmit to an external apparatus identification information of content data stored in the transmission apparatus and to receive additional information associated with the content data from the external apparatus; a searching unit configured to search content data from said transmission apparatus based on a comparison between the additional information received from the external apparatus and a search term; a display unit configured to display a first list indicating content data matching the search term; an editing unit configured to edit a second list of content data based on the first list, said second list registering a plurality of content data; and a transmission unit configured to transmit a plurality of content data to a reproduction apparatus based on the edited second list.