A device for setting initializing data for every destination in an electronic device has a microcomputer for controlling the electronic device and an external memory connected to the microcomputer. In the initializing-data setting device, the microcomputer includes: a ROM for storing in advance initializing data for microcomputer provided for every destination to be stored in the microcomputer and initializing data for external memory provided for every destination to be stored into the external memory; a destination designating unit for designating a destination; a destination determining unit for determining the designation contents by the destination designating unit in an initializing-data setting mode; and a CPU for performing such an operation in the initializing-data setting mode that the CPU reads out initializing data for microcomputer corresponding to a destination from the ROM on the basis of the result of determination made by the destination determining unit, and sets the read-out data in the external memory, and further reads out initializing data for external memory corresponding to the destination from the ROM, and sets the read-out data in the external memory.