Method for sharing A/V content over network, sink device, source device and message structure

The shared how to share the A / V content on the network, a sink device, the source device and the message structure is disclosed in accordance with the present invention. To share the A / V content via a network in accordance with the present invention, from a source device which provides the A / V content to the steps and, the source device receiving the information about the state that share the A / V content sending a request that requests are sent to the shared a / V content, and a step of, in response to the request, receives the a / V content from the source and the shared device. According to the above configuration of the present invention, and is able to share one content from a plurality of devices on the network. In particular, it is possible to provide a wider variety of scenarios by the receiving device having a user interface providing a content share mode.