Abstract: According to one embodiment, a commodity sales data processing apparatus includes a printing unit, an input unit, a printing-data creating unit, a correcting unit, and a printing control unit. The printing unit prints a receipt. The input unit receives input of information concerning a commodity. The printing-data creating unit creates, on the basis of information concerning commodities input via the input unit, printing data for causing the printing unit to print a receipt including detail information of a transaction. The correcting unit corrects the printing data such that the length of the receipt printed by the printing unit on the basis of the printing data is reduced. The printing control unit causes the printing unit to print a receipt based on one of the printing data created by the printing-data creating unit and the printing data corrected by the correcting unit.