A beam refraction apparatus includes an input fiber carrying an input beam. The first internal power supply voltage is supplied to a memory cell array via a first power supply line, and the second internal power supply voltage is supplied to a peripheral circuit via a second power supply line. The controller controls a transmission to transmit to a destination device a control signal if the first data signal transmitted to the partner device exists, and no second data signal to be transmitted on the first channel exists in the device. Two columns of various types of product review information provided by sources such as professional reviewers, existing owners, and the user’s friends may be displayed below the product carousel.