1. A measuring method of scintillation appearing on a display image of a display device installed with a light source, the method including: capturing the display image from a plurality of capturing positions respectively having different capturing angles relative to the display image to obtain a plurality of captured images; and acquiring scintillation by comparing pixels of the captured images each corresponding to a common pixel of the display image and acquiring data of pixels having different luminance as scintillation information, wherein in the capturing, the display image is captured with a marker pattern displayed thereon to obtain the captured images, and in aquiring the scintillation, positions of the maker patterns in the captured images are matched with each other, and pixels located at a common position in the captured images are compared as the corresponding pixels.