Abstract: An information display system of the present disclosure includes: an acquiring unit that acquires position information of a display device displaying a real space image, an imaging device capturing an image of a predetermined target object, and the target object within a captured image captured by the imaging device; an aligning unit that makes a position of the target object within the captured image correspond to a position of the display device based on the position information; a generating unit that generates a virtual image of the target object based on the position information of the target object; and a display control unit that controls the display device to display the virtual image of the target object made to correspond to the position of the display device so as to be superimposed on the real space image.

Abstract: To provide synchronizing methods, optical switch modules, center devices, remote devices, optical access systems, optical access networks, programs, and recording media in the optical access network which can give the connection start time of the upstream optical switching element of the optical switch module. To the optical switch module, ranging functions are provided and the center device OLU carries out ranging of the optical switch module OSM as is the case of ranging of the remote device ONU. The center device OLU transmits the difference between roundtrip time of the remote device ONU and roundtrip time of optical switch module OSM, which is the result of these rangings, to the optical switch module OSM, and the optical switch module OSM can obtain the contact start time of the upstream optical switching element by calculating the contact start time using the difference.