Abstract: A self-checkout system includes a checkout device that checks out a product registered by a portable terminal, a camera that captures an image of a scene where a customer attempts to register the product, a detector that detects a registration failure state where registration of the product is determined to have failed during a period in which the registration of the product according to a single transaction is attempted, and a display that displays, during a period in which the checkout device is checking out the product registered according to the single transaction, the detected registration failure state.

Abstract: A weighing and pricing device includes: a processor that executes a registration process for a product to be purchased by a customer; a transceiver that: establishes a connection between a mobile device possessed by the customer and the weighing and pricing device; and upon establishing the connection, receives, from the mobile device, identification information that identifies the mobile device; and a storage that stores information relating to the product and the identification information in association with each other. After the registration process is interrupted, the transceiver receives, from the mobile device, identification information. The processor specifies the product associated with the stored identification information that corresponds to the identification information received after the registration process. The processor recommences the registration process for the specified product.

Abstract: A mobile terminal includes: a processor that acquires a type of a product sold by weight; and a transceiver connected to the processor and that establishes intercommunication with a weighing device that weighs the product sold by weight; a storage connected to the processor. The processor causes the transceiver to acquire, from the weighing device, a weight value of the product sold by weight weighed by the weighing device. The processor registers, in the storage, the type of the product and the weight value that corresponds to the type of the product.

Abstract: A self-checkout system includes: a checkout device that checks out a product registered by a portable terminal; a camera that captures an image of a scene where a customer attempts to resister the product; a detector that detects a registration failure state where registration of the product is determined to have failed during a period in which the registration of the product according to a single transaction is attempted; and a display that displays, during a period in which the checkout device is checking out the product registered according to the single transaction, the detected registration failure state.

Abstract: A weighing and pricing device includes: a processor that executes a registration process for a product to be purchased by a customer; a transceiver that: establishes a connection between a mobile device possessed by the customer and the weighing and pricing device; and upon establishing the connection, receives, from the mobile device, identification information that identifies the mobile device; and a storage that stores information relating to the product and the identification information in association with each other. After the registration process is interrupted, the transceiver receives, from the mobile device, identification information. The processor specifies the product associated with the stored identification information that corresponds to the identification information received after the registration process. The processor recommences the registration process for the specified product.

Abstract: A mobile terminal includes: a processor that acquires a type of a product sold by weight; and a transceiver connected to the processor and that establishes intercommunication with a weighing device that weighs the product sold by weight; a storage connected to the processor. The processor causes the transceiver to acquire, from the weighing device, a weight value of the product sold by weight weighed by the weighing device. The processor registers, in the storage, the type of the product and the weight value that corresponds to the type of the product.