[Means for Solving the Problems] Obtaining endoscopic images (E1), (E2) captured by an endoscope inserted in a large intestine and representing an inner surface of a wall of the large intestine, generating, from a three-dimensional image representing a three-dimensional area including the large intestine, an adjacent blood vessel image (Q1) depicting a portion of the blood vessel adjacent to the wall from a viewpoint in the three-dimensional image corresponding the viewpoint of the endoscopic images (E1), (E2), generating, from a three-dimensional image representing a three-dimensional area including a surrounding area of the large intestine, a surrounding blood vessel image (Q2) depicting the blood vessel from a viewpoint in the three-dimensional image corresponding the viewpoint of the endoscopic images (E1), (E2), and causing the endoscopic images (E1), (E2), adjacent blood vessel image (Q1), and surrounding blood vessel image (Q2) to be displayed in this order on a display means.
