PURPOSE: To shorten a transaction time and to omit a troublesome operation by continuously executing an input processing such as a cash input without stopping a payment transaction when the plural payment transactions are continuously executed and the first input amount is insufficient.

CONSTITUTION: When the paid amount by information read from a recording medium, which is accepted at a second time onward, by a read means 42 is larger than a balance stored in a processing means 20, an input means controls a process so that a shortage may be paid. That is, when the plural payment transactions are continuously processed and the first inputted amount is short, the payment transaction is not stopped, and the input processing such as the cash input is successively executed. Thus the payment transaction can be continuously processed by the simple operation, and the troublesome operation as usual can be omitted.