Abstract: In an integrated circuit for arithmetic operation and display control connected to a power source (46) and a liquid crystal display device (45), and energized by the power source, including an arithmetic operation circuit (42) for performing a designated artithmetic operation, wherein the result of the arithmetic operation is displayed by the display device, a boosting circuit (43) receives and boosts the voltage from the power source (46), a drive circuit (44) is powered by the boosting circuit (43) to drive the liquid crystal display device (45), and a control circuit (41) causes interruption of the driving of the display device when the arithmetic operation circuit (42) is carrying out the arithmetic operation.