provided is a device and method for controlling switchover of a broadcasting channel in a digital multimedia broadcasting receiver . the device includes a first demultiplexing unit for firstly buffering transport stream packets , searching the buffered transport stream packets for a pat , a pmt , and an intra frame , and obtaining program information on the broadcasting channel to be switched over ; and a second demultiplexing unit for secondly buffering the transport stream packets and , on the basis of the obtained program information , searching the secondly buffered transport stream packets for an audio or video transport stream packet of the corresponding broadcasting channel , and performing audio or video demultiplexing for the searched audio or video transport stream packet .