A three-dimensional image displayed by a conventional medical computer system
is
not displayed on the basis of anatomic landmarks, so that a plurality of images
cannot be compared with one another and examined on the basis of the same reference
surfaces and references. In this invention, a three-dimensional image is constructed
and displayed on the basis of multi-tomographing image data. Anatomic landmarks
in the displayed three-dimensional image are specified, and reference planes are
created on the basis of the landmarks. When the reference planes are created, the
three-dimensional image is displayed upon correcting the position thereof such
that it becomes an image based on the reference planes. As a result, an image displayed
in three dimensions is an image based on anatomic reference planes, so that it
can be anatomically directed in three-dimensions. Therefore, it is possible to
obtain an image having good reproducibility.
