Abstract: A method of making a synthetic image in a simulation system for attachment of spectacles, in which a synthetic image of image pickup data of a spectacles frame taken in at a first magnification and image pickup data of a person's image derived from an imaging apparatus is made by a computer, and a state in which the person wears a pair of spectacles is displayed by a display apparatus, characterized by the steps of: calculating a second magnification to an actual person of the display image on a display screen on the basis of the coordinates of the positions of the apexes of the corneas of both of the right and left eyes which are detected from a still image on the display screen of a person who does not wear a pair of spectacles which is picked up by the imaging apparatus and is transmitted to the computer and on the basis of the information of the distance between the pupils of the person which is input from the computer; calculating the spectacles frame synthetic position on the display screen and a third