PURPOSE: To omit operation to reregister information inputted before interruption by processing the information inputted before the interruption and information inputted after restarting altogether as one transaction related to the interrupted transaction.

CONSTITUTION: The above system possesses a keyboard 1, an input control part 2, a buffer control part 3, a buffer 4, an operation/output control part 5, receipt/journal printer 6 and a magnetic disk device 7. Then, when the input of a first transaction information is restarted after the input of the first transaction information is interrupted and after the input of the second transaction information is executed, the first information inputted before interruption is held temporarily and tabulation processing is executed with it and the first transaction information inputted after restarting altogether as the one piece of transaction information. Thus, time to reregister the information inputted before the interruption comes to be unnecessary.