To solve the problem that when such an error as the clogging of currency occurs, it is difficult for an operator to perform any operation to restore POS terminal equipment by releasing the error.

The selling merchandise sales registration data processing terminal equipment includes: a fare adjustment part for transmitting and receiving data with a currency receiving and paying part, and for instructing the currency receiving and paying part to make payment in accordance with a balance between an amount of money input by an operator and an amount of money of deposit currency from a customer; a display part having a customer side screen and an operator side screen for displaying transaction information including merchandise to be purchased by the customer, a merchandise unit price, and a total amount of money; and a control part for making the display part display the occurrence of an error in any of the selling merchandise sales registration data processing terminal equipment itself and the currency receiving and paying part and the release method of the error on the operator side screen. The control part is configured to make the display part display a standby request to the customer or a guidance to another selling merchandise sales registration data processing terminal equipment on the customer side screen.