A three-dimensional model display device and a model display system in which even a beginner can easily edit a model, and edit and watch a moving image using a model while maintaining harmony of a model, a texture, and a motion. When a user clicks a selection button of “trying-on”, performed is a preview display about how an avatar possessed by the user is displayed when the avatar wears a cloth, a hairstyle, an item, and an accessory desired to be tried on. A head size, a body portion size, and a bust portion size of the avatar possessed by the user are managed in a user management table. Display data related to the preview display displayed on the display screen of the model display device is dynamically generated by a model display server based on the head size, the body portion size, and the bust portion size.