Disclosed herein are a device and a method for an optical signal changeover that will not necessitate any addition to the capacity of the optical signal selection unit even when the N\xd7M optical switches are expanded in scale, but can keep the optical signal selection unit compact in size and enhance the reliability of the unit. The terminal device displays a list of contents on a display unit based on the page information, and displays an icon in case the list is provided with the consecutive reproduction function to demonstrate that the consecutive reproduction is possible. Each metal oxide nitride layer alternates with a Ce layer, and the outermost nano-composite layer is a metal oxide nitride layer. The Recipient needs only the Transfer PIN and a Cash Card to receive the money transfer at a participating remote location. Various other methods, systems, and computer-readable media are also disclosed. The polarization nulling can be performed using a heuristic multipoint extrema search method, such as Nelder-Mead method.