PROBLEM TO BE SOLVED: To simply create problems for review in which incorrect answers are resolved on the basis of answer sheet.SOLUTION: An image reading part 12 acquires image data by reading answer sheet. A mark detection part 81 detects a specific mark 71 showing an incorrect answer from the image data. A blank region identifying part 82 identifies a blank region based on the detected specific mark 71. A blank region processing part 85 makes the blank region of the image data blank and creates the image data for review. An output part 86 outputs the created image data for review.SELECTED DRAWING: Figure 1
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