A pairing method for causing lighting devices to store identification information of a radio remote controller serving as a master device is provided. The method includes: transmitting a pairing command including the identification information of the radio remote controller repeatedly on a temporary basis by the radio remote controller; determining, for each of the lighting devices, whether or not the lighting device is in an initial state in which identification information of a master device is not stored in the lighting device, at power on; storing the identification information included in the pairing command, if the paring command is received when it is determined that the lighting device is in the initial state in the determining; and causing the lighting device in which the identification information of the master device is stored to operate according to a radio command including the identification information of the master device.