The invention discloses a microprocessor for channel switching of a vehicle radio. When the quality of a current broadcast signal of a radio becomes poor, the processor inquires a current program type from a broadcast signal frequency band information look-up table on the basis of the frequency of the current broadcast signal, inquires the same kind of broadcast programs consistent with the current program type in an administrative region in which a vehicle is at present from the broadcast signal frequency band information look-up table, and sends out a command related to channel switching of the radio. Correspondingly, the invention also discloses a system and a method for channel switching of the vehicle radio. The microprocessor, method and system are helpful for improving driving safety and comfort.