Abstract: A POS system including at least one store server and a plurality of POS terminals. Each POS terminal includes means for transmitting transaction data to the store server as a transaction occurs at the POS terminal, means for querying the store server for transaction data relating to a transaction that occurred at another POS terminal, means for instructing the store server to cancel the transaction that occurred at the other POS terminal, and means for executing a transaction cancel instruction received from the store server to cancel a transaction that occurred at the POS terminal, and the store server includes means for receiving a transaction cancel instruction from a POS terminal other than the POS terminal at which the transaction occurred, and for transferring the transaction cancel instruction to the POS terminal at which the transaction occurred.

Abstract: The POS system of the present invention comprises at least one store server and a plurality of POS terminals. Each POS terminal includes means for transmitting transaction data to the store server as a transaction occurs at the POS terminal, means for querying the store server for transaction data relating to a transaction that occurred at another POS terminal, means for instructing the store server to cancel the transaction that occurred at that other POS terminal, and means for executing a transaction cancel instruction received from the store server to cancel a transaction that occurred at the POS terminal, and the store server includes means for receiving a transaction cancel instruction from a POS terminal other than the POS terminal at which the transaction occurred, and for transferring the transaction cancel instruction to the POS terminal at which the transaction occurred.