ENDOSCOPE SYSTEM

An endoscope system includes an endoscope that captures a living tissue in a body cavity, and an image processing unit. The endoscope includes an objective lens provided on a front side of a light receiving surface of an image sensor and configured to simultaneously form images of the living tissue, obtained through a plurality of windows, on the light receiving surface as the captured image. The image processing unit includes a three-dimensional expansion processor configured to calculate different directions of a feature part visible through the plurality of windows based on position information in each of images of the feature part, which is distinguishably identified from other parts and included in common in the plurality of images obtained through the plurality of windows in the captured image captured by the endoscope, and to expand two-dimensional information of the images of the feature part to three-dimensional information.