PURPOSE: To securely perform the additional registration of even an article as a single item by providing a data memory wherein whether or not each article is a single item and quantity data on the additional registration are set and a control means which automatically issues a receipt at the end of the additional registration.

CONSTITUTION: When a salesclerk presses an in-department key, a control circuit 1 performs a specific process to detect additional registration data being set in a specific area. Then the input of additional registration data is expected and when the salesclerk operates its department key at a customer's request, the control circuit 1 which detects the additional registration data being inputted increases the contents of a formed counter by one and compares the counter value with the value in a data memory. In this case, the data are stored in the specific area of the data memory 5, so once the matching is detected, the receipt is issued. Therefore, even when an article is set to a single item, the receipt is not issued once the article is inputted, and the additional registration data can be inputted.