A combination system has an input unit (117, 180) to input the set-up value, plural set-up value storage units (115, 125) to store the input set-up value, and a controller (114, 123) to control a set-up value storage operation with respect to the set-up value storage units. A user inputs the set-up value as data about an operation mode of each of the devices through the input unit. The controller judges whether the set-up value input into one of the devices is the same type value as a pre-set up value with regard to another device of the system. When the set-up value is determined to be the same type value, then the controller sets up the pre-set up value as a common set-up value with regard to the plural devices. Accordingly, the user does not have to input the set-up value individually for each of the devices.