In coupling a control station transmitting a radio signal to a plurality of base stations each transmitting the radio signal to a terminal station by an optical fiber, and dependently connecting the plurality of base stations to the optical fiber, the control station includes a radio signal transmitter and an electrical-to-optical converter. This system enables to annul the pressure at the closed mouth of the gun by relieving the pressure in the supply line. Then, at a push of a shutter button in the image shooting mode, the communications terminal shoots an image to generate image data, automatically attaches the image data to an e-mail message, and transmits the e-mail message to the e-mail address specified by the user before the image shooting. The press passage is configured such that it has an initial press section leading into a final press section.