Patent ID: 7711250

Claim:
An apparatus for processing a transport stream in a digital broadcasting system, the apparatus comprising: a channel classifying decoder to receive a multi-program transport stream (MPTS) and output a single-program transport stream (SPTS) of a selected channel using channel selection information from a user; a transport stream demultiplexer to demultiplex the SPTS and output a plurality of packets; a video/audio decoder for decoding image/voice packets; a data processing unit for decoding a data packet, and providing the video/audio decoder with a clock pulse for synchronizing voice and image; and a multi-screen controller to receive selection information about a multi-screen from the user and to enable the video/audio decoder to process the multi-screen; wherein a screen number field informing the number of input video signals is included in a program access table (PAT) of an SPTS corresponding to the selected channel, and wherein a program mapping table (PMT) of the SPTS corresponding to the selected channel includes a priority order number (Priority_Order_number) field for representing a priority of a program ID (PID), which is used to determine an output order of the plurality of image signals.