flickered by delaying them by t time of fig2 b in other words when the infrared generator is not photographed per one frame the infrared camera device 100 transmits signals to the infrared generator 10 through the wireless communication unit 140 and flickers infrared rays by delaying them by t time thereby the infrared generator can be photographed once every two frames when the first infrared generator 10 is photographed once every two frames the second infrared generator 20 is turned on to perform the photographing at this time three cases may occur hereinafter each case will be described with reference to fig4 to 6 fig4 shows a case where one infrared generator is photographed per each frame fig5 shows a case where two infrared generators 10 and 20 are photographed once every two frames and fig6 a 6b show a case where one infrared generator is photographed every two frames fig4 shows a normal case wherein different infrared generators can perform the photographing per one frame such that two infrared generator can be distinguished and tracked fig5 shows a case where two infrared generators are photographed per one frame the signals are transmitted to the second infrared generator 20 that is turned on and delays it by t time so that the infrared generator 20 generates infrared rays thereby since different infrared generators are photographed per one frame the two infrared generators can be distinguished and the position thereof can be tracked fig6 a 6b show a case where one infrared generator is photographed every two frames wherein the case is divided into two cases fig6 a shows the first case the signal is transmitted to the second infrared.