To provide a memory mapping system of a control part more suitable for the intended use of electronic equipment such as reduction of current consumption.

Operations more suitable for the intended use of the equipment are realized by executing a part of programs to control the electronic equipment after transferring it to another memory in the optimal timing. For example, in order to solve a problem of current consumption when the electronic equipment is set to a power saving state, a means to access an internal memory (RAM) after once copying only a part to influence the current consumption in the entire program into the internal memory is used.