To save power by setting the power supplying and cutting requirements for each unit and controlling the supply and cut-off of power to each unit individually based on the requirements.

The CPU 31 controls a circuit device based on the program stored in the ROM and stores the control data so that the data can be read out by the ROM. The CPU is provided with a calendar circuit 32 to count the present time and a power supply 33 for control to control the operations of a display 12 for customers, a card/slip processing section 34, a coin processing section 35, a paper money processing section 36, an external storage section 37, a sending and receiving circuit 38, a customer detecting sensor 15, and a main power supply section 39, The stand-by state of the ATM is set for each business hour: a business hour having many customers, a business hour having a little customers, and a business hour having almost no customers. When the ATM is not used for a specified periof of time, the power saving program set in the CPU switches the ATM to a power saving state appropriate for the stand-by state set for each business hour. By this method, the minimum necessary power can be supplied, resulting in saving power.