The invention aims to reduce the amount of circuitry in a receiver for receiving broadcast radio waves transmitted using an IBOC system that allows simultaneous transmissions of an analog broadcast and a digital broadcast with the same content. The amount of circuitry is reduced by making provisions to reproduce only a monaural signal from an analog demodulator. To reduce the unnaturalness that may occur when switching from the digital broadcast to the analog broadcast, a blend processing section mixes the two signals in a smoothly varying ratio during the switching.