1. A digital broadcast receiver comprising: a decoding device comprising: a system decoder demultiplexing broadcast streams to separate the broadcast streams into a video stream, a thumbnail image stream and an auxiliary data stream, wherein the thumbnail image stream includes a first program identifier (ID), a first scene ID, and a thumbnail image; a video decoder decoding the video stream and the thumbnail image stream; and a data decoder decoding the auxiliary data stream, the auxiliary data stream including a second program identifier (ID) identifying a specific program generated by the decoded video stream and a second scene ID identifying a specific scene of the specific program, wherein the decoding device is configured to match the first program ID with the second program ID and the first scene ID with the second scene ID; and a display unit displaying the thumbnail image generated by the decoded thumbnail image stream with a scene of the specific program upon matching the first program ID with the second program ID and the first scene ID with the second scene ID.