A wireless communication system comprising: a plurality of wireless communication devices each of them including a display unit; and an information terminal device configured to perform wireless communication with each of the plurality of wireless communication devices, wherein the information terminal device includes a field intensity calculation unit configured to determine a field intensity of a detected radio signal from each of the plurality of wireless communication devices, a communication device selection unit configured to select at least one wireless communication device of the plurality of wireless communication devices according to each field intensity determined by the field intensity calculation unit, a terminal display unit configured to display identification information of the at least one wireless communication device selected by the communication device selection unit, a terminal input unit configured to receive a selection operation of selecting identification information displayed on the terminal display unit and an operation to specify one wireless communication device according to the identification information displayed on the terminal display unit, and a terminal wireless communication unit configured to perform data communication with the wireless communication device specified on the terminal input unit, wherein each of the plurality of the wireless communication devices includes a light-emitting unit configured to emit light when the selection operation is received by the terminal input unit; characterized in that each of the plurality of wireless communication devices is a remote control configured to operate facility equipment of a same type, and each includes an authentication data issuing unit for issuing authentication data used for determining whether to permit or reject operation of the facility equipment by the information terminal device, and the display unit is configured to display the authentication data issued by the authentication data issuing unit; wherein the display unit is further configured to display the authentication data together with the identification information. a plurality of wireless communication devices each of them including a display unit; and an information terminal device configured to perform wireless communication with each of the plurality of wireless communication devices, wherein the information terminal device includes a field intensity calculation unit configured to determine a field intensity of a detected radio signal from each of the plurality of wireless communication devices, a communication device selection unit configured to select at least one wireless communication device of the plurality of wireless communication devices according to each field intensity determined by the field intensity calculation unit, a terminal display unit configured to display identification information of the at least one wireless communication device selected by the communication device selection unit, a terminal input unit configured to receive a selection operation of selecting identification information displayed on the terminal display unit and an operation to specify one wireless communication device according to the identification information displayed on the terminal display unit, and a terminal wireless communication unit configured to perform data communication with the wireless communication device specified on the terminal input unit, wherein a field intensity calculation unit configured to determine a field intensity of a detected radio signal from each of the plurality of wireless communication devices, a communication device selection unit configured to select at least one wireless communication device of the plurality of wireless communication devices according to each field intensity determined by the field intensity calculation unit, a terminal display unit configured to display identification information of the at least one wireless communication device selected by the communication device selection unit, a terminal input unit configured to receive a selection operation of selecting identification information displayed on the terminal display unit and an operation to specify one wireless communication device according to the identification information displayed on the terminal display unit, and a terminal wireless communication unit configured to perform data communication with the wireless communication device specified on the terminal input unit, wherein each of the plurality of the wireless communication devices includes a light-emitting unit configured to emit light when the selection operation is received by the terminal input unit; characterized in that each of the plurality of wireless communication devices is a remote control configured to operate facility equipment of a same type, and each includes an authentication data issuing unit for issuing authentication data used for determining whether to permit or reject operation of the facility equipment by the information terminal device, and the display unit is configured to display the authentication data issued by the authentication data issuing unit; wherein the display unit is further configured to display the authentication data together with the identification information.