1. A pointer light tracking method of shooting pointer light projected on a display with a camera to obtain image data and tracking the pointer light projected on the display with a computer based on the obtained image data, the method comprising the steps of: projecting an all black image and white square images located at four corners of the all black image on the display; storing central coordinates (X 1 , Y 1 )-(X 4 , Y 4 ) of the four white square images; shooting with the camera the display where the all black image and the four white square images are displayed; extracting four domains corresponding to the four white square images from image data obtained from the camera; computing central coordinates (x 1 , y 1 )-(x 4 , y 4 ) of the extracted four domains; computing parameters for performing distortion correction using projection conversion for a coordinate expressing a position of the pointer light on the display based on the computed central coordinates (x 1 , y 1 )-(x 4 , y 4 ) and the central coordinates (X 1 , Y 1 )-(X 4 , Y 4 ) of the four white square images; shooting the display that displays only the pointer light and a presentation image; adjusting at least one of a shutter speed, exposure, or gamma value of the camera shooting the display displaying both the pointer light and the presentation image to obtain pointer light image data where only the pointer light is strongly displayed.