1. A method of presenting a combined image in which an image of a real space is combined with a virtual image of a virtual object, the method comprising: receiving image data for a plurality of captured images, the plurality of captured images including images relating to different respective parts of the real space; generating modeling image data, representing an image covering at least a predetermined portion of the real space, based on the received image data for the plurality of captured images; estimating light source information relating to the real space based on the modeling image data; generating virtual image data, representing the virtual image, including managing light source information relating to the virtual object based on the estimated light source information relating to the real space; and updating the modeling image data following receipt of image data for a new captured image relating to such a part of the real space, and updating the estimated light source information relating to the real space based on the updated modeling image data, and updating the light source information relating to the virtual object based on the updated light source information relating to the real space, and regenerating the virtual image data.