PURPOSE: To prevent the system breakdown, by not only saving information required for restoration into a non-volatile memory but also increasing the cooling capability of a capability variable cooling means when a temperature detector detects a temperature higher than a prescribed value and restoring the processing when the temperature is lowered to a value lower than the prescribed value.

CONSTITUTION: Plural temperature sensors S and cooling fans 3 where the cooling capability is variable are arranged in a CPU having a print aggregate of an electronic circuit of a computer 1. A disc device 6 is provided on the outside of the computer 1, and the print aggregate 2 is connected to the disc device 6, and electric power is supplied to the print aggregate 2 by a power supply device 4. When each sensor S detects a temperature higher than a prescribed value, a power supply controller 5 interrupts the print aggregate 2 and saves data required for restoration onto the disc device 6 and controls the device 4 to increase the capability of each fan 3, and the processing is restored when the temperature is lowered to a value lower than the prescribed value; and thus, the system breakdown is prevented.