A radio receiver that receives a first broadcasting signal on which alternative frequency data including information on a frequency of a broadcasting station which broadcasts a program the same as a program corresponding to the first broadcasting signal being received is superposed, the radio receiver comprising: a front end configured for receiving the first broadcasting signal and converting the first broadcasting signal into an intermediate frequency signal; a bandpass unit configured for receiving the intermediate frequency signal output from the front end and allowing a component of the intermediate frequency signal included in a predetermined pass-band width to pass; a reception state determination unit (17, 43) configured for determining a reception state of the first broadcasting signal being received; a bandwidth determination unit configured for determining a reduced pass-band width of the bandpass unit in accordance with the reception state determined by the reception state determination unit when the reception state of the first broadcasting signal is deteriorated due to occurence of adjacent channel interference; and an alternative broadcasting station determination unit (16, 17, 45) configured for receiving a second broadcasting signal specified by information on a frequency represented by the alternative frequency data; characterized in that the alternative broadcasting station determination unit (16, 17, 45) is configured for determining a reception state of the second broadcasting signal while the pass-band width of the bandpass unit is set to the reduced pass-band width determined by the bandwidth determination unit in accordance with the reception state of the first broadcasting signal when the reception state of the first broadcasting signal is deteriorated due to occurence of adjacent channel interference. a front end configured for receiving the first broadcasting signal and converting the first broadcasting signal into an intermediate frequency signal; a bandpass unit configured for receiving the intermediate frequency signal output from the front end and allowing a component of the intermediate frequency signal included in a predetermined pass-band width to pass; a reception state determination unit (17, 43) configured for determining a reception state of the first broadcasting signal being received; a bandwidth determination unit configured for determining a reduced pass-band width of the bandpass unit in accordance with the reception state determined by the reception state determination unit when the reception state of the first broadcasting signal is deteriorated due to occurence of adjacent channel interference; and an alternative broadcasting station determination unit (16, 17, 45) configured for receiving a second broadcasting signal specified by information on a frequency represented by the alternative frequency data; characterized in that the alternative broadcasting station determination unit (16, 17, 45) is configured for determining a reception state of the second broadcasting signal while the pass-band width of the bandpass unit is set to the reduced pass-band width determined by the bandwidth determination unit in accordance with the reception state of the first broadcasting signal when the reception state of the first broadcasting signal is deteriorated due to occurence of adjacent channel interference.