A broadcast receiver, comprising: a first tuner unit connected to a first antenna; a second tuner unit connected to a second antenna; a phase diversity processing unit configured to combine or select an output of the first tuner unit and an output of the second tuner unit, and output a first IF signal and a second IF signal; a first demodulation unit configured to include a first state detection unit that detects a quality of the first IF signal, and a first RDS unit that extracts a multiplex data signal, and demodulate the first IF signal; a second demodulation unit configured to include a second state detection unit that detects a quality of the second IF signal, and a second RDS unit that extracts a multiplex data signal, and demodulate the second IF signal; an audio signal processing unit configured to have a muting function of processing an audio signal output from the first demodulation unit and adjusting a volume output, an amount of change in volume per unit time of the muting function being capable of being set; and a control unit connected to the first tuner unit, the second tuner unit, the phase diversity processing unit, the first demodulation unit, the second demodulation unit, and the audio signal processing unit, wherein the control unit is configured to select, based on a result of determining a reception state acquired from the first state detection unit and the second state detection unit, any one of a diversity reception operation of controlling the first tuner unit and the second tuner unit to select a first broadcast, and controlling the phase diversity processing unit to perform a diversity operation, and a search operation of performing control so that any one of the first tuner unit and the second tuner unit selects a first broadcast, and the other searches for a second broadcast, when the control unit performs switching from the diversity reception operation to the search operation, the control unit is configured to control the audio signal processing unit to decrease the amount of change in volume per unit time, and then to perform the switching from the diversity reception operation to the search operation, and when the control unit performs switching from the search operation to the diversity reception operation, the control unit is configured to perform the switching and then to control the audio signal processing unit to increase the amount of change in volume per unit time. a first tuner unit connected to a first antenna; a second tuner unit connected to a second antenna; a phase diversity processing unit configured to combine or select an output of the first tuner unit and an output of the second tuner unit, and output a first IF signal and a second IF signal; a first demodulation unit configured to include a first state detection unit that detects a quality of the first IF signal, and a first RDS unit that extracts a multiplex data signal, and demodulate the first IF signal; a second demodulation unit configured to include a second state detection unit that detects a quality of the second IF signal, and a second RDS unit that extracts a multiplex data signal, and demodulate the second IF signal; an audio signal processing unit configured to have a muting function of processing an audio signal output from the first demodulation unit and adjusting a volume output, an amount of change in volume per unit time of the muting function being capable of being set; and a control unit connected to the first tuner unit, the second tuner unit, the phase diversity processing unit, the first demodulation unit, the second demodulation unit, and the audio signal processing unit, wherein the control unit is configured to select, based on a result of determining a reception state acquired from the first state detection unit and the second state detection unit, any one of a diversity reception operation of controlling the first tuner unit and the second tuner unit to select a first broadcast, and controlling the phase diversity processing unit to perform a diversity operation, and a search operation of performing control so that any one of the first tuner unit and the second tuner unit selects a first broadcast, and the other searches for a second broadcast, when the control unit performs switching from the diversity reception operation to the search operation, the control unit is configured to control the audio signal processing unit to decrease the amount of change in volume per unit time, and then to perform the switching from the diversity reception operation to the search operation, and when the control unit performs switching from the search operation to the diversity reception operation, the control unit is configured to perform the switching and then to control the audio signal processing unit to increase the amount of change in volume per unit time.