A broadcast receiving device and a method for receiving a broadcast thereof are provided. The broadcast receiving device includes a channel receiving unit which receives a channel broadcasting signal, generates a first parallel signal from the received channel broadcasting signal, converts the parallel signal into a serial signal, and outputs the serial signal; and a main body unit which receives the serial signal output from the channel receiving unit, reconverts the received serial signal into a second parallel signal, processes the second parallel signal, and outputs a video signal, an audio signal, and an additional data signal extracted from the processed second parallel signal. Since the channel receiving unit is provided as a separate unit from the main body unit, the thickness of the broadcast receiving device can be further reduced.