1. An image management system comprising: a photographing device including a photographing means installed at a fixed point, for obtaining image data representing an image of a person by photographing the person and an output means for outputting the image data; a photographing control device for controlling the photographing means so that the photographing means continuously photographs a plurality of times at a predetermined time interval and causing the photographing device to obtain a plurality of image data; an image selecting device including a judging means for judging whether or not a person included in each of a plurality of photograph images represented by each of the plurality of image data has his/her eyes open and a selecting means for selecting a single set of image data representing a photograph image which includes the person who is judged to have his/her eyes open; and a storage device for storing the single set of image data selected by the image selecting device.