The disclosure is related to displaying a three dimensional image and corresponding sectional images. A display device may include a data storage, an input interface, an image display, and a processor. The data storage may store image data. The input interface may receive position information of a first image point from a user. The image display may display a 3D image in a first display region and a sectional image of the 3D image in a second display region of the screen. The processor may generate the 3D image data to display the 3D image by locating the first image point of the 3D image at a first position in the first display region and the sectional image data to display the sectional image of the 3D image by locating a second image point of the sectional image at a second position in the second display region.
