Patent ID: 7870583

Claim:
A digital broadcast receiver comprising: a broadcast receiving unit for simultaneously receiving digital broadcast data on a plurality of channels; a broadcast output unit for simultaneously outputting real-time broadcast data of a particular one of the channels and still images of the remaining channels on a single screen; and a still image updater for periodically updating the still images of the remaining channels, while continuing the outputting of the real-time broadcast data of the particular one of the channels, wherein the still image updater comprises an I-frame detector for repeatedly detecting an I-frame in broadcast data of a current minor channel on an I-frame period basis and an I-frame storage for storing detected I-frames of minor channels and updating a stored I-frame of the current minor channel with a newly detected I-frame, wherein the I-frame detector compares sizes of received image frames and detects a relatively large image frame as an I-frame, and wherein the broadcast output unit comprises a major channel buffer for storing real-time broadcast data of a major channel and an image synthesizer for generating a screen output image using the real-time broadcast data stored in the major channel buffer and I-frames stored in the I-frame storage.