These above problems could be solved by using immersing AR technologies. The main reason of the above problems is frequent eye moving of the worker. The reason why the frequent eye moving is required is that there is a physical distance between the work object and the paper manual. Therefore, it is possible to decrease the eyes moving of the worker, by superimposing onto the work object, even measurement results of measuring devices. The graphical superimposing technology is one of AR technology that enables the fusion of a real world and virtual world. Also, work process control is merged into the virtual world by a PC. Thus, the worker has not to need search the page due to work process branching, he/she can concentrate his/her work with helpful prompts by the PC. Also, it gets easier to find port to be inspected similar by superimposing eye-catching markers [3].