PURPOSE: To improve processing efficiency, by utilizing a microcomputer.

CONSTITUTION: On a basis of the radius of curvature, an inter-angle, a tangent length, etc. and a table generated by a computer, curve setting is performed in the field in consideration of a longitudinal inclination, the amount of cut ground, the amount of buildup, etc. Next, information to an office are entered on a field book. Information to the office such as a station name, a forecast of the left structure, a forecast of the right structure, the length from the center stake of the field to the left structure, the length from that to the left structure, a base height, a projected height, the section length from this station to the just preceding station, pole crossing from the center stake to the left, and pole crossing from the center stake to the right are processed as data in the microcomputer.