In a system for function settings of operating components in a piece of electronic equipment, a microcomputer circuit (4) of a radio receiver outputs function control signals to a radio receiver circuit (2), based on operating input signals. An input-output port correspondence setting program is downloaded from an external personal computer (8) to the microcomputer circuit (4), this program displaying a correspondence guide screen on a display of the external personal computer (8) and generating control function assignment data between groups of operating components (31a, 31b), (32a to 32c), and (33a to 33c and 34a to 34c) having the same type and characteristics. This data is transferred to the microcomputer circuit (4), so that the microcomputer circuit (4) sets the relationships of correspondence between the input and output ports (4d) and (4e), based on the input-output port correspondence setting program.