Centralized changes of display specifications are made from a remote place without operating a display section of each air conditioning apparatus. A remote controller (4) is provided with a display section (41) and an operating section (42). The display section (41) displays an operating status and a setting status of an air conditioning apparatus (20) by switching specifications of a plurality of kinds. Therefore, the specifications of a plurality of kinds are prepared in the display section (41). A communications section (31) receives a command (S) for switching specifications of air conditioning operation and display to be performed by the air conditioning apparatus from a central controller (10).Since the command (S) includes a packet storing information indicating display specification switching, the central controller (10) centrally and separately controls from a remote place not only the air conditioning operation of the air conditioning apparatus (20) but also switching of the display specifications for the display section (41), without operating the display section (41) for each air conditioning apparatus.
