A 3-dimensional model of an antigen is regarded as a display subject and a 3-dimensional model of an antibody is regarded as a comparison subject. A portion of the molecular surface of the display subject at a distance enabling binding with the comparison subject is cut out as a display surface. The 3-dimensional model of the antigen, which is the display subject, is displayed in a rotated state, where the normal of the display surface is rotated to point in a counter viewing direction, whereby the 3-dimensional model is rotated in a viewing coordinate system. The display surface alone is displayed in color, whereas other portions of the molecular surface are not, thereby enabling the display surface of the antigen that is at a distance enabling binding with the antibody to be displayed at a position easily viewed by the user.