A self-service commodity sales data processing device that includes a take-out determination unit for determining whether commodities were taken out simultaneously based on an image of a commodity taken out, a first identical termination unit for determining whether taken-out commodities are different commodities or identical commodities if the take-out determination unit determines that the commodities are taken out simultaneously, a reading unit for reading information of the taken-out commodities, a second identical determination unit for determining whether the commodities read by the reading unit are the identical commodity if the first identical determination unit determines that the taken-out commodities are different commodities, and a suspension unit for suspending the transaction if the second identical determination unit determines that the commodities are the identical commodity.