Disclosed herein is a method of displaying an existence probability of an electron in a hydrogen atom. In the method, N radii are referred to as r1 to rN in ascending order. An area proportional to the surface area of a sphere having a radius rn (n is any of 1 to N) is referred to as Sn. A value proportional to an existence probability of an electron at a distance rn from the center of a hydrogen atom is referred to as Pn. The method includes displaying a circle having an area Sn for all n from 1 to N in a concentric manner, and displaying small symbols which are Pn in number on the circle having the area Sn in an equally spaced manner for all n from 1 to N and in such a manner that small symbols associated with a circle having a larger radius is partly hidden behind a circle having a smaller radius.