Abstract: A system for performing a combined transaction service with a cash receiving unit having a cash inlet for accepting the cash inserted into the inlet upon checking the cash, a cash dispenser having a cash outlet for releasing a specified amount of cash to the outlet upon counting up the amount, keys for entering amounts of money for depositing and withdrawing transactions, a key for setting a combined transaction service, a display for showing transaction information, and a payment balance register for storing the amount of money to be paid for each transaction of the combined transaction service. When the system is set for the service, the amount of money accepted by the cash receiving unit and the amount of money to be withdrawn for each transaction is added to the register, and the amount of money to be deposited for each transaction is substracted from the register.