A self-service point-of-sale (POS) terminal for a customer to register a commodity to be purchased in a store, includes an input device, a reading device configured to read a symbol on a commodity, a network interface configured to receive, from an external device operated by a store clerk or the like, instruction information that instructs output of caution information, and a processor. The processor is configured to acquire commodity information about a commodity based on the symbol read by the reading device and register the commodity using the commodity information. Upon receipt of an input of completion of registration via the input device, the processor determines whether to proceed to payment processing for the registered commodity based on whether the instruction information has been received from the external device.