Abstract: A settlement device can acquire a payment amount and a balance of electronic money. When the balance is less than the payment amount, the settlement device gives a notification of a necessary charging amount set based on an amount of money obtained by subtracting the balance from the payment amount. The settlement device receives an input of money. When the necessary charging amount is notified and an input of money equal to or greater than the necessary charging amount is received, the settlement device settles a transaction by updating the balance to the amount of money obtained by subtracting the payment amount from the amount of money obtained by adding the input amount of money to the balance.

Abstract: A settlement device can acquire a payment amount and a balance of electronic money. When the balance is less than the payment amount, the settlement device gives a notification of a necessary charging amount set based on an amount of money obtained by subtracting the balance from the payment amount. The settlement device receives an input of money. When the necessary charging amount is notified and an input of money equal to or greater than the necessary charging amount is received, the settlement device settles a transaction by updating the balance to the amount of money obtained by subtracting the payment amount from the amount of money obtained by adding the input amount of money to the balance.

Abstract: A sales data processing apparatus includes a member rank accepting unit, a point accepting unit, an extraction unit, and a calculation unit. The member rank accepting unit accepts an input of a member rank of a customer as of when a point voucher is used. The point accepting unit accepts an input of a number of points on the point voucher. The extraction unit extracts, from a storage unit which stores a point return rate defining how much should be returned in dollars for one point corresponding to a member rank, the point return rate corresponding to the member rank accepted by the member rank accepting unit. The calculation unit calculates an amount of return on the point voucher on the basis of the number of points accepted by the point accepting unit and the point return rate extracted by the extraction unit.