A 3D geometry enhancement method and an apparatus therefor. A random forest regressor is built using sketch patches and displacement patches, wherein the displacement patches are patches corresponding to the sketch patches and placing on a displacement map of a 3D geometry model. A new sketch is received. Displacement patches respectively corresponding to sketch patches are extracted by applying the sketch patches extracted from the new sketch to the built random forest regressor. A displacement map with respect to a 3D geometry model is generated using the extracted displacement patches. The generated displacement map is applied to the 3D geometry model.