The surface world in the movie Silent Hill referred to the external world of the real world, which was one of the parallel universes. In this world, there were monsters that were similar to the real world. These monsters were called "Surface Monsters" and had the same terrifying and mysterious characteristics as the monsters in the real world. The existence of the surface world may be to show the connection between the real world and the parallel universe, as well as the fear and exploration spirit of humans towards the unknown. In the movie, there was a connection between the surface world and the real world, which might imply the existence of parallel universes or that human exploration of the unknown might bring unexpected consequences. Although the existence of the surface world was not directly related to the real world, it added some mysterious color and disturbing atmosphere to the plot of the movie.