Abstract: Display apparatus retrieves the form and position data for each of a plurality of three-dimensional objects from an environmental data memory and gives a two-dimensional figure display of the plurality of three-dimensional objects on the display in accordance with the form and position data for these objects. When a two-dimensional figure includes interference between two or more objects, a line-of-sight vector, along which it is possible to display two-dimensional figures free from interference, is calculated, and interference-free two-dimensionally displayed figures for the plurality of three-dimensional objects are generated in accordance with the computed line-of-sight vector and the form and position data for each object.