Method of receiving an enhanced service and video playback device to

A method for receiving an enhanced service in a video display device (100) that plays a content, the method comprising: Receiving (S2001) of an uncompressed audio-visual (AV) contents; Extracting (S2002) the first attribute information from the received uncompressed AV content; Transmitting a query based on the extracted first feature information to a first server; characterized in that the method further comprises: Receiving a polling period for a request to a second server corresponding to the query from the first server; and Submitting a request in accordance with the polling period.