A commodity sales data processing apparatus registers, if a code obtained by a receiver is a first code for identifying a commodity, sales data of the commodity identified by the first code. The apparatus acquires, if the code input by the receiver is a second code for identifying a commodity group ordered via a network, data of the commodity group identified by the second code from a saving destination where data of ordered commodities is saved. The apparatus registers, based on the data acquired from the saving destination, sales data of a commodity included in the commodity group identified by the second code. The apparatus executes settlement processing based on the sales data of the commodity identified by the first code and the commodity included in the commodity group identified by the second code.