PURPOSE: To calculate quickly the file capacity by storing previously the file attribute, the question information needed for calculation of the file capacity, etc. to the corresponding file.

CONSTITUTION: A question file 1 stores previously the question information needed for calculation of the file capacity. A file attribute file 10 stores previously the attribute of each file. A question reading part 2 reads the questions out of the file 1 and sends them to an input/output control part 3. The part 3 displays a question text on a display 5. When an answer is supplied through a keyboard 6, a keyboard control part 4 sends the input answer to a capacity arithmetic part 8.