Multiplex broadcast receiving apparatus and multiplex broadcast receiving method

A multiplex broadcast receiving apparatus (1) includes a main tuner (4) for receiving a program broadcast multiplexed with a multiplexed broadcast wave; a sub-tuner (5) for receiving road traffic information, multiplexed with the multiplexed broadcast wave, which is transmitted at a predetermined interval; and a control section (9) for checking a state in which an alternative station frequency of the same program broadcast as that which is being received by the main tuner (4) is received while the sub-tuner (5) does not receive the road traffic information and for enabling the main tuner (4) to follow up on the alternative station frequency in which the receiving state is satisfactory. The control section (9) changes the period in which the follow-up operation is performed in accordance with the transmission interval of the road traffic information.