The computer operation in recent years is the mainstream of the mouse interface. However, these mouse interfaces have a fault. It is that a flat place is indispensable. The existing mouse interface cannot escape these constraints. Therefore, the purpose of this study is to conquer the fault
of a mouse without using the existing mouse. Then, we propose the system that puts "Marker" as a new mouse interface and makes it function as a mouse. From this, it becomes possible to use mouse function even if there is no existing mouse interface. Moreover, the new mouse interface which does not need the flat place which is a fault of the existing mouse interface is realized.