An image synthesizing system for synthesizing more than one item of divisional image data respectively representing more than one divisional image of more than one portion of an object. The more than one item of divisional image data and additional information are supplied to a synthesizing unit, where the additional information indicates that the more than one item of divisional image data represents a series of images related to each other. The synthesizing unit synthesizes the more than one item of divisional image data based on the additional information to obtain an item of synthesized image data representing a synthesized image.