The present invention is a vehicle planning support system (1) for displaying vehicle models (84, 92, etc.) on a screen to support vehicle planning, and comprises specification value input screen display means (36) for displaying specification value input screens for inputting specification values including dimensions and angles in the vehicle model; 3D morphing screen display means (58) for displaying vehicle models as deformable three-dimensionally shaped 3D vehicle models based on specification values input on the specification value screen using the 3D morphing screen; 2D morphing screen display means (56) for displaying vehicle models as deformable two-dimensionally shaped 2D vehicle models based on specification values input on the specification value screen using the 2D morphing screen.