1. An object collation method comprising: a registration procedure registering registered data of a registered object in a database; and a collation procedure collating on an object collation apparatus an input image of a target object with said registered data, said registration procedure comprising the steps of: inputting a three-dimensional shape of the registered object and reflectivity of a surface of the registered object; acquiring a texture group indicating luminance and color information of each location of the surface of the registered object under various illumination conditions by using said three-dimensional shape and said reflectivity; generating a texture space, which is an image space, defined by said texture group; and storing said three-dimensional shape and said texture space, and said collation procedure comprising the steps of: taking a two-dimensional image of the target object as an input image; presuming location and position of the target object in said input image; converting the input image into an input texture by using said three-dimensional shape and said presumed location and position; calculating distance between said texture space and said texture obtained at said converting step; and collating the target object and the registered object based on said distance.