1. An insertion support system comprising: virtual image generating means for generating a virtual image of the body cavity path within a subject based on the image data of a three-dimensional region of the subject; route starting-point setting means for setting the starting-point of an insertion route of an endoscope to the body cavity path within the subject; region-of-interest setting means for setting the region of a portion of interest within the subject; route extracting means for extracting the multiple insertion routes to the region of the portion of interest from the starting-point; and route verifying means for verifying the multiple insertion routes extracted by the route extracting means.