PURPOSE: To permit to continue the operation of the titled device automatically and independently by respective terminal control units without employing any backup unit when a central control unit is broken by a method wherein respective terminal control units are added with the operation control function, inputting function, most of the memorizing function of input condition and monitoring function of the central control unit.

CONSTITUTION: Respective terminal control units 2aW2e are provided respectively with ROM8, having operation programs such as temperature control or the like based on the informations of RAM7, memorizing command setting information from the central control unit 1, the command setting information of the terminal control unit itself and the informations of temperature, pressure or the like, and these devices are connected to the central operation unit 6 through a path 15. The path 15 is connected with a key board interface 11, inputting commanding and setting informations, an A/D converter 12, inputting analog data of temperature, pressure or the like and converting them into digital values, an output interface 13, outputting an alarm to the outside upon detecting the abnormality of the central control unit 1, an input and output interface 14, controlling the objective air-conditioning or refrigerating device, and the like and the contents changing operation of the information such as command, setting or the like may be effected by the key board interface 11 on the terminal control unit itself when the central control unit 1 is broken.