To extend generous services to a repeater customer, which is helpful for sales promotion.

The merchandise sales registration data processor includes: a holding part for dividing privilege data into two or more pieces of data and holding them; a printing part for printing sales information for each transaction and one of the data divided into two or more pieces on a receipt; and a control part for confirming the number of times of registrations in the past on the basis of customer information and instructing the printing part to print one of the data divided into two or more pieces different from the data provided in the previous time. The data divided into two or more pieces and printed for each transaction are restored to the privilege data by connecting them all. Thus, the generous services to the repeater customer are extended to be helpful for sales promotion.