A graphical user interface will be extremely useful, for example, in equipment such as printers that require maintenance. The easy understandability of manuals due to 3D expressions are very pleasant for the users.

Naturally, even the common user manuals of digital equipment can be made into electronic manuals using graphical expressions in digital equipment having display devices, which can effectively reduce the cost of production of manuals with increased number of pages due to a large number of functions.