[Aim] To more easily change link / non-link of switching display between plural display areas in which tomograms are displayed when the tomograms obtained from plural image groups, respectively, are observed by being displayed in such a manner to be arranged.[Solution Means] A linked switching partial area and a non-linked switching partial area are set in at least one display area in which a tomogram is to be displayed. An input operation that gives an instruction to switch the tomogram is received in the display area. Only the tomogram displayed in the display area is switched to a tomogram succeeded by or succeeding the displayed tomogram in the same image group when the input operation has been performed in the non-linked switching partial area. The tomogram displayed in the display area is switched to the tomogram succeeded by or succeeding the displayed tomogram in the same image group and the tomogram displayed in each of the other display area or areas is also switched to a tomogram that is included in the same image group as the tomogram displayed in each of the other display area or areas and related to the tomogram displayed after switching in the display area in which the input operation has been performed when the input operation has been performed in the linked switching partial area.
