1. An object displaying method of a system comprising: an object to be displayed in a virtual three-dimensional space; two reference objects A and B displayed in said virtual three-dimensional space; a panel for controlling said reference objects displayed; and display means for displaying said object, wherein said panel has: a function of moving said reference object A in the virtual three-dimensional space; a function of translating said reference object B while maintaining a relative relation with said reference object A when said reference object A is moved in the virtual three-dimensional space; a function of revolving said reference object B around an origin defined in said reference object A as a center; a function of changing a radius of turn of said reference object B; and a function of switching display contents of the object displayed in the virtual three-dimensional space between display from a view point of said reference object A and display from a view point of said reference object B, and said display means is allowed to display a desired part of said object by a displaying operation of said panel.