1. An image processing method comprising: a position/orientation acquisition step of acquiring a position and orientation of a viewpoint; a virtual image creation step of creating a virtual image on the basis of the position and orientation of the viewpoint; a holding step of holding an environment mapping image; an image extraction step of extracting a mapping image from the environment mapping image on the basis of a line-of-sight direction of the viewpoint and a viewpoint rotation component about an axis in the line-of-sight direction; and an environment mapping step of executing environment mapping processing for the virtual image created in the virtual image creation step by using the mapping image extracted in the image extraction step.