Patent ID: 7444339

Claim:
A portable terminal device comprising: a reproduction unit configured to reproduce a plurality of content data items; a control unit configured to detect a reproduction status of each content data item when said each content data item is reproduced by said reproduction unit, and to select a recommendation content data item from said plurality of content data items depending on a reproduction status of said recommendation content data item; and a communication unit configured to transmit to another portable terminal device a list which shows a plurality of content data items including said selected recommendation content data item; wherein the reproduction status of said recommendation content data item is selected from a group comprising the recommendation content data item having been reproduced by the reproduction unit for a predetermined period of time, a particular portion of the recommendation content data item having been reproduced by the reproduction unit, the entirety of the recommendation content data item having been reproduced by the reproduction unit, the recommendation content data item having been reproduced by the reproduction unit after being rewound, the recommendation content data item having been reproduced by the reproduction unit during a particular time of day, the recommendation content data item having been reproduced by the reproduction unit a predetermined number of times, and the recommendation content data item having been designated by a user.