To provide a centralized control device of show cases or the like, which can correspond to the requirement of data from the outside smoothly, and which can protect data in a store side, in the case of controlling a plurality of show cases or the like together.

This centralized control device controls the operating conditions of a plurality of show cases SC or the like together, and it comprises a main control device 3 that is set at a store to collect data from each show case SC or the like, and a remote control device 2 that is set in the maintenance management side. The main control device 3 and the remote control device 2 transmit and receive data through a telephone line L. The telephone numbers of a plurality of remote control devices 2 are registered in the main control device 3, and priority ranking can be set for each telephone number.