A signal selector selects one of a ground wave digital signal and a digital cable television signal in accordance with program selection information and transmits the selected signal to a shared tuner circuit. The shared tuner circuit selects only a signal of a desired channel from a signal output from the signal selector and converts the selected signal to an IF signal. An 8VSB and QAM demodulation circuit receives the IF signal from the shared tuner circuit and demodulate the signal in an 8VSB or QAM system to generate a transport stream. Thus a tuner for ground wave digital broadcasting and that for digital CATV broadcasting can be implemented as a shared tuner circuit surrounded by a single casing.