When the intake input mode is set and a 2D function key, such as “√{square root over ( )}” or “a/b,” is operated in a state where the cursor has been moved to an arbitrary position on the formula displayed on the display unit of an electronic calculator, the range of the formula covered by the input 2D function (or to be calculated) is determined on the basis of the position of the cursor by recognizing a formula part sandwiched by parentheses or a chunk of the formula part of a function with parentheses, recognizing a chunk of a formula part of a 2D function, recognizing a chunk of a formula part with successive numerals and characters, and recognizing the position of an arithmetic symbol (“+,” “−,” “×,” or “÷”) or a delimiter (“:” or “,”). The determined range is taken in by the input 2D function.