A reference image is displayed by processing spatial distribution to image
data recording. A screen for inputting a corresponding command is
displayed when requested. A corresponding slab is a three-dimensional
slab rendered according to an input of a slab control command on a
displayed screen. The three-dimensional rendered slab is also displayed.
When the slab control command is designated among the Sagittal image, the
Coronal image, and the Axial image on the displayed screen, the image
designated on the basis of the reference image is displayed. When the
slab control command is designated as a request to Rotate on the
displayed screen, it is checked whether a new rotation center is
designated. When the new rotation center is designated, volume or
interest (VOI) planes are rotated on the basis of the new rotation center
and the image is generated and displayed.