Checkout system and settlement device

A checkout system which is configured such that a registration device generating accounting data necessary for settlement of a transaction on the basis of input data and a plurality of settlement devices performing a settlement process on the basis of the accounting data are connected to each other through a network and which is configured to sequentially transmit the accounting data generated by the registration device through the network in a transmission order which is set between the plurality of settlement devices,

• wherein each of the plurality of settlement devices includes
• a reception unit that receives the accounting data transmitted through the network,
• a determination unit that determines whether or not the device performs the settlement process of the accounting data received by the reception unit in preference to another settlement device having a precedent transmission order, on the basis of predetermined determination conditions,
• a transmission unit that transmits identification information of the device when the determination unit determines that the device preferentially performs the settlement process in a case where the transmission order set in the device is not final, and transmits identification information of the another settlement device having a precedent transmission order when the determination unit determines that the another settlement device preferentially performs the settlement process, together with the accounting data, and
• a notification unit that notifies the registration device of the identification information of the device when the determination unit determines that the device preferentially performs the settlement process in a case where the transmission order which is set in the device is final, and notifies the registration device of the identification information of the another settlement device having a precedent transmission order when the determination unit determines that the another settlement device preferentially performs the settlement process, and
• wherein the registration device includes a reporting unit that makes a report for guiding a customer to the settlement device identified by the identification information which is given notice of by the notification unit.