ENERGY SUPPLY SYSTEM

PROBLEM TO BE SOLVED: To provide an energy supply system in which operation can be performed so that the change of a unit price display is performed when a customer is present. SOLUTION: A POS body 20 is provided with: a timing means 20A; a determination meas 20B; a display control means 20C; and a unit price change means 20D. The timing means 20A times the current time, and displays the time on a monitor 84. A determination means 20B determines whether the current time matches a unit price change time stored in a storage device 22 or the unit price change prior time, which is prior to the unit price change time by a prescribed time. When it is determined that the current time matches the unit price change time or the unit price change prior time, a display control means 20C makes a monitor 84 display the determined result. When the instruction of the setting change of the unit price is made after it is determined that the current time matches the unit price change time or the unit price change prior time, a unit price change means 20D performs change to the unit price stored in the unit price storage part 22A. COPYRIGHT: (C)2011,JPO&INPIT