Abstract: A method of displaying air-conditioning management information including selecting an extracting position corresponding to a specific room for a layout image of a floor having a plurality of rooms, displaying a partial image extracted from the layout image of the floor having the plurality of rooms such that the partial image shows the specific room at the extracting position together with operating-state data on at least one air conditioner assigned to the specific room, and shifting the extracting position in units of rooms.

Abstract: In an optical communications apparatus of one office having a light sending device which has a plurality of coupling ends adapted to be coupled with a light transmitting optical fiber for connecting individual offices and which sends a transmission signal in the form of light, and a light receiving device which receives a light signal; an optical communications apparatus comprising light sending means connecting the respective coupling ends and the light sending device through optical fibers, light receiving means connecting the respective coupling ends and the light receiving device through optical fibers, and pass-through means for passing the light signals between the coupling ends.