1. A medical image processing apparatus, comprising: a storage that stores three-dimensional images of a tubular body, a virtual endoscopic image generating unit that generates, by using the three-dimensional images of the tubular body, virtual endoscopic images when the inside of the tract is observed based on a view point location and view direction placed inside the tract of the tubular body, a region identifying means that obtains an observation region and/or non-observation region based on the view point location and view direction by using the three-dimensional images, an image generating unit that generates an image which corresponds to the observation region and/or non-observation region, the image being distinguishably displayed on the image obtained from the three-dimensional images.