PURPOSE: To execute much more existing applications in a mode for driving a single task operating system by including a function capable of executing an existing application for directly controlling hardware in the title system.

CONSTITUTION: An interchangeable mode is a mode for driving an existing single task operating system as a task to allow a multitask operation system to execute much more applications and a normal mode is a mode other than the interchangeable mode. In the multitask operation system, the interchangeable mode and the normal mode are driven. During the period of plotting a graphic without using a graphic controller in the normal mode, a plotting speed is slightly delayed, but the graphic can be plotted by using the graphic controller in the interchangeable mode.