Method of synchronizing a plurality of content directory device (CDS) devices, CDS device, and system

A content directory service (CDS) device comprising:

• a synchronization descriptor which comprises synchronization information for synchronization with other CDS device;
• a synchronization descriptor management unit which manages the synchronization descriptor;
• and
• an embedded control point (CP) which exchanges the synchronization information with the other CDS device.

A system comprising:

• a media server which comprises a plurality of content directory service (CDS) devices, the media server providing multimedia content;
• a media renderer which renders the provided multimedia content;
• and
• a control point (CP) which controls the media server and the media renderer to communicate with each other and supports synchronization of the CDS devices,
• wherein the CP requests a first CDS device among the plurality of CDS devices of a home network to start synchronization, the first CDS device performs the synchronization with a second CDS device among the plurality of CDS devices, and a third CDS device among the plurality of CDS devices performs synchronization with the first CDS device or the second CDS device.

A computer readable recording medium storing a computer program for performing a method of synchronizing a plurality of content directory service (CDS) devices of a home network which comprises the plurality of CDS devices and a control point (CP), the method comprising:

• (a) requesting a first CDS device among the plurality of CDS devices to start synchronization using the CP;
• (b) performing the synchronization with a second CDS device among the plurality of CDS devices using the first CDS device;
• (c) selecting a third CDS device from the plurality of CDS devices and requesting the third CDS device to start synchronization with the first CDS device or the second CDS device using the CP;
• and
• (d) performing the synchronization with the first CDS device or the second CDS device using the third CDS device.