A medical simulation apparatus is provided, which is capable of performing
a simulation by correlating a three-dimensional image with an entity
model.Coordinates of measurement marks MP1, MP2, MP3 on a surface of a
lower dental arch model 62 in a coordinate system defined by three
reference marks MK1, MK2, MK3 are acquired before and after displacement
of the lower dental arch model 62. The coordinates thus acquired are
converted into coordinates in a coordinate system defined by reference
marks PK1, PK2, PK3 on the basis of a relationship between the reference
marks MK1, MK2, MK3 and the reference marks PK1, PK2, PK3. Then, changes
in the coordinates after displacement of the lower dental arch model 62
are determined, and a region preliminarily specified in a
three-dimensional image displayed on a display 5 is displaced on the
basis of the coordinate changes thus determined.