A response time measurement system including a measurement apparatus and a measurement facility , the response time measurement apparatus being configured to be connected to the measurement facility and being a portable instrument, the measurement facility including at least one of a plant consisting of a plurality of devices, a power facility, a communication facility, a transportation facility, and being connected via a distribute control system (DCS) and an information processing system (IPS) to a console, the console including the output screen and displaying the operation information of the measurement facility on the output screen , wherein the response time measurement apparatus comprises: a transceiver configured to receive capture information from a capture device for capturing the output screen ; and a controller configured to control the capture device and the transceiver , the controller is configured to apply a test signal to the measurement facility through the transceiver , and detect an output time, the output time being a time at which a response corresponding to the test signal is displayed on the output screen based on the capture information, and the controller further configured to measure a response time of the measurement facility based on the output time, wherein the capture information comprises a plurality of images of the output screen consecutively captured by the capture device from a time at which the test signal is applied by the controller , and the capture information further comprising time information for each captured image, and the controller is configured to detect a screen change image, the screen change image having a change on the output screen among the plurality of images, the controller is further configured to detect the time information for the screen change image, and subtract a time at which the test signal is applied by the controller from a time at which the screen change image is captured by the capture device to measure the response time of the measurement facility . a transceiver configured to receive capture information from a capture device for capturing the output screen ; and a controller configured to control the capture device and the transceiver , the controller is configured to apply a test signal to the measurement facility through the transceiver , and detect an output time, the output time being a time at which a response corresponding to the test signal is displayed on the output screen based on the capture information, and the controller further configured to measure a response time of the measurement facility based on the output time, wherein the capture information comprises a plurality of images of the output screen consecutively captured by the capture device from a time at which the test signal is applied by the controller , and the capture information further comprising time information for each captured image, and the controller is configured to detect a screen change image, the screen change image having a change on the output screen among the plurality of images, the controller is further configured to detect the time information for the screen change image, and subtract a time at which the test signal is applied by the controller from a time at which the screen change image is captured by the capture device to measure the response time of the measurement facility . <EOS>