| 摘要 |
PROBLEM TO BE SOLVED: To provide an electronic commerce method in which a predetermined number is added to quantity of a product and a predetermined number is subtracted from the quantity of the product by a difference in how a quantity button is pushed.SOLUTION: A quantity button 33, which composes the button for adding a predetermined number to the quantity of a product when a button is pushed in a first pushing manner, and subtracting the number from the quantity when the button is pushed in a second manner, is displayed. |
