PROBLEM TO BE SOLVED: To generate information for quantitatively estimating the emotional intensity of an observer who has observed an image.SOLUTION: A variable neutral image varied in the luminance of a neutral image according to time is output in a first time interval, and a variable target image varied in the luminance of an input target image according to time is output in a second time interval. First pupil diameter information corresponding to the pupil diameter of the observer in the first time interval, and second pupil diameter information corresponding to the pupil diameter of the observer in the second time interval, which are input with respect to them, are used to generate information for estimating the emotional intensity of the observer who has observed the target image, using a device.
