A data processing apparatus, which is connected to an inspection tool and an review tool via a network, automatically receives inspection result file regarding defect information from the inspection tool and image information from the review tool. Moreover, the data processing apparatus makes comparative check between the defect, image, and attribute information outputted from the inspection tool and the defect, image, and attribute information observed in the review tool. Finally, the data processing apparatus displays, on its window, both of the above-described information in a manner of being organized and arranged side by side.