An endoscope system 1 includes: a memory portion 21 that stores preoperative multi-slice image data 16a-16n an image processing portion 22 that constructs three-dimensional data 31 based on the preoperative multi-slice image data 16a-16n and extracts a predetermined luminal organ a position detection 4 that acquires position information of an image pickup portion a position alignment portion 23 that makes position information of the image pickup portion correspond to coordinates of the three-dimensional data 31 and a determination portion 26 that determines whether or not the image pickup portion passes through a lumen in the three-dimensional data 31 of the predetermined luminal organ. The image processing portion 22 creates an image in which determination information 52 that was determined by the determination portion 26 is superimposed on the three-dimensional data 31 of the predetermined luminal organ.
