1. A defect review apparatus having a function of capturing an image of a sample under observation and extracting an area corresponding to each defect from the image as a defect image, the defect review apparatus comprising: an electronic optical system that images the sample under observation and outputs the acquired image as an image signal; a defect detection processor that extracts the defect image; an automatic defect classification processor that automatically classifies the defects into a plurality of categories; and screen display means for displaying judgment information used to judge which category among the categories into which the automatic defect classification processor has automatically classified the defects needs to undergo manpower-based manual classification; wherein: the automatic defect classification processor contains a plurality of pieces of threshold information based on which the defect classification is performed, and pieces of the judgement information for the plurality of thresholds are calculated based on the automatic defect classification results obtained for the plurality of thresholds.