PURPOSE: To efficiently execute the commodity sales by calculating and storing automatically the sales revised amount of money related to an actual result of sales of the own machine in each terminal machine, and also, outputting it so that it can be printed and displayed in accordance with a request.

CONSTITUTION: In a file controller 30, unit price answer transmitting means 31, 32 are provided, and also, in each terminal machine 10A-10N, sales revised money amount calculating means 11, 12, a sales revised money amount storage means 13M and sales revised money amount output control means 11, 12 are provided. Moreover, in each terminal machine 10A-10N, this machine is constituted so that the sales revised money amount related to an actual result of sales of the own machine is calculated and stored automatically, and also, printed and outputted in accordance with a request. Accordingly, at every terminal machine 10A-10N, sales actual result data can be known in a real time. Also, the sales revised money amount output control means 11, 12 are formed so that the sales revised amount of money is printed and outputted on a report together with the number of sales points and the sales amount of money, therefore, the utility value in a relation to the sales amount of money of the sales revised amount of money can be further improved, and it is practical.