1. A target object detection apparatus for identifying a target object by using at least a camera and a wireless tag provided on the target object which exists at outside of the target object detection apparatus, comprising: a target detector for reading first identification information documented in the wireless tag; an image processor for extracting first image information of the target object imaged by the camera; a personal identifier for identifying an imaged target object by comparing the first image information extracted by the image processor and second image information specific to the target object; an integration processor for determining third identification information of the target object based on at least second identification information identified by the personal identifier and the first identification information read by the target detector; and a certainty computer for computing a first certainty of the first identification information read by the target detector, wherein the personal identifier computes a second certainty of the second identification information identified by the personal identifier, and wherein when the second identification information identified by the personal identifier and the first identification information read by the target detector for a single target object are different, the integration processor determines the third identification information of the target object based on the second certainty computed by the personal identifier and the first certainty computed by the certainty computer.