An air-conditioning apparatus controller includes a light-emitting indicator that emits light in a plurality of colors, a main display that displays a setting screen for light-emitting indication by the light-emitting indicator, a touch panel through which an instruction related to settings displayed on the main display is input, a data processing unit of a controller that causes the main display to display the setting screen, and performs setting processing for assigning an indication color to an indication content to be provided by the light-emitting indicator, in accordance with the instruction transmitted from the touch panel, and a data storage unit that stores settings for the processing performed by the data processing unit.