1. An information processing method for displaying a physical space and a virtual space by mixing the physical space and the virtual space, the information processing method comprising: an obtaining step of obtaining information about markers placed in the physical space; a position/orientation calculating step of calculating a position and orientation of a viewpoint; an area calculating step of calculating area information about mixing accuracy between the physical space and the virtual space based on the information about the markers; and an image display step of displaying an image by visually representing the area information based on the position and orientation and by mixing the area information on the physical space.