Abstract: A personal computer (1) comprises a tomographic image information acquisition section (6), a memory (9), and a volume rendering computer (13). The tomographic image information acquisition section (6) acquires tomographic image information. The memory (9) is connected to the tomographic image information acquisition section (6) and stores voxel information related to tomographic image information. The volume rendering computer (13) is connected to the memory (9), samples voxel information in a direction perpendicular to the sight line on the basis of voxel information, and sets a restricted display area and an endoscopic display area acquired by the endoscope and produced by the volume rendering computer (13), and displays these on a display (2).

Abstract: A personal computer (1) of a surgery assistance system (100) performs navigation during surgery while combining and displaying an image of the distal end (surgical instrument image (33a)) of a surgical instrument (33) and a distance from the surgical instrument distal end to the resection site, in a three-dimensional image produced by a volume rendering computer (13).