1. An information acquisition apparatus having a sensing device configured to sense an object, and a reading device configured to read information of a tag attached to the object, comprising: an extracting device configured to extract information concerning a characteristic of an object in an image sensed by said sensing device; and a discrimination device configured to discriminate a position of the object corresponding to the information of the tag read by said reading device, on the basis of the information concerning the characteristic of the object in the sensed image extracted by said extracting device and the information of the tag read by said reading device.