Upon accepting a region dividing operation, a display input apparatus sets a line, which passes through a predetermined region, as a first reference line; sets an end edge of the predetermined region, which is opposite to the first reference line, as a second reference line; obtains a ratio for input numerical value calculation, namely, a ratio of a distance from the first reference line to the second reference line and a distance from the first reference line to a division line of the predetermined region divided by the region dividing operation; obtains a numerical value by multiplying a maximum value or minimum value in a numerical value input range by the ratio for input numerical value calculation, and displays the obtained numerical value in a numerical value input screen.