According to one embodiment of the invention, a task management section of an operating system is notified of temperature abnormality by the notification that the rotation rate of the cooling fan reaches a specified rate, it executes measures to reduce the load of the processor: for example, (1) discriminating a program that does not require real-time execution, with reference to the task management table and forcibly stopping the program; (2) discriminating a program that requires real-time execution and that is in operation in a normal status, with reference to the task management table, and simplifying or omitting a process of the program; and (3) discriminating a program of a low priority of real-time execution from the programs that require real-time execution, with reference to the task management table, and forcibly stopping the program.