PROBLEM TO BE SOLVED : To provide a method for immediately obtaining a digital image by arranging a CCD matrix where the obtained image is projected in an image area concerning a unit provided with a camera having fish-eye optical equipment.SOLUTION : An object image file assembling method is for assembling the file of an object image such as a part of a city, a part of a street or the internal part of a house, and a desired image is rapidly located by the method. The method is characterized by digitally storing many panoramic images photographed from successive photographing positions into a computer and by selecting the photographing positions so as to have relation between the photographing positions, that is, selecting the photographing positions so as to partially and mutually superimpose the image of the photographing position on the image photographed from the successive photographing position or to adopt only the panoramic image of property to be sold by a real estate agent, for example, as the image.