A measured data digitization apparatus digitizes measured data based on image data obtained by reading paper data including the measured data indicated on an X-Y plane, and includes a straight line extracting unit extracting straight lines from the image data, an X-Y axis obtaining unit obtaining two orthogonal straight lines as X and Y axes, respectively, a numerical value obtaining unit obtaining numerical values around the X and Y axes from the image data, an area setting unit setting an area on the X-Y plane defined by the X and Y axes based on minimum and maximum values of the numerical values that are respectively obtained for the X and Y axes and a measured data obtaining unit obtaining the measured data in the area as numerical value data on the X and Y axes from the image data.
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