1. A game apparatus displaying a character object within a three-dimensional virtual space, comprising: a contour information generator which generates contour information for forming a contour of each part of said character object; a first line model generator which generates a first line model being a line polygon model along a contour of a first part of said character object on the basis of said contour information; a second line model generator which generates a second line model being a line polygon model along a contour of a second part of said character object, and arranged at a back of said first line model in a Z direction on the basis of said contour information; a first mask model generator which generates a first mask model being a transparent polygon model that is arranged at the back of said first line model in the Z direction and in front of said second line model in the Z direction, and having the contour along said first part on the basis of said contour information; a background depicter which depicts a background; and a model depicting processor which depicts the respective models with a Z comparison performed after depicting by said background depicter, wherein said model depicting processor first depicts said first mask model, depicts said second line model after said first mask model, and depicts said first line model after said second line model.