1. A method for reviewing defects, the method comprising the following steps: using positional information of defects on a test sample detected by a defect detecting apparatus to irradiate and scan an electron beam focused on an area including said defects in said test sample; detecting secondary charged particles generated from said test sample, by irradiating and scanning the electron beam, under a first detection condition to obtain a first inspection image of the area including said defects; detecting the secondary charged particles generated from said test sample, by irradiating and scanning the electron beam, under a second detection condition to obtain a second inspection image of the area including said defects; comparing said first inspection image with a first reference image to obtain a first binarized image by voltage contrast; comparing said second inspection image with a second reference image to obtain a second binarized image by voltage contrast; judging whether said defects are open defects or short defects from said first binarized image; identifying a generating location of the open defects by processing said first binarized image in the case where the defects are judged as open defects as a result of the judgment; and identifying a generating location of short defects by processing said second binarized image in the case where the defects are judged as short defects as a result of the judgment.