PURPOSE: A method for making a previous road register capable of protecting main facility is provided to make the road register of a specific region by registering the contents of a current state. CONSTITUTION: A supplementary control point is installed in a construction predetermined area by using existing reference point(S10). An external point is actually measured by using a measurement equipment(S20). A coordinate and altitude of the external point is registered on an electronic controller. The external point is connected and an outline is displayed(S30). The indicated outline is calculated(S40). A central line of the road is calculated based on the calculated outline(S60). The content of the road is formed by the calculated value.
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