The present invention provides a computing method for accounting, comprising: (a) the first step of installing and storing spreadsheet software capable of creating accounting screens each of which is a matrix of cells including input setting cells and output displaying cells; (b) the second step of storing functional formulas and/or operational expressions for use in determining, based on numerical values entered in the input setting cells, numerical values to be displayed in the output displaying cells; (C) the third step of calling the accounting screens of at least N different kinds to develop and arrange the same on the display; (d) the fourth step of entering a given numerical value in a predetermined input setting cell; and (e) the fifth step of performing predetermined computations, based on the entered, given numerical value, according to the functional formulas and/or operational expressions to display numerical values indicative of the computation results in predetermined output displaying cells so as to complete each of the accounting screens.