A facilities controlling device includes a file acquiring portion that acquires a screen file from a storing portion and acquires a corresponding image file, display script file and processing script file from the storing portion, a data processing portion that acquires, from a device, device data corresponding to data identifying information in the screen file acquired by the file acquiring portion, and performs data processing on the acquired device data based on a processing script in the processing script file corresponding to the device data obtained by the file acquiring portion, and a display processing portion that displays, in a screen, the device data produced by the data processing portion and a symbol of the image file acquired by the file acquiring portion, based on the display script in the display script file acquired by the file acquiring portion.