PURPOSE : To evaluate a land on each drawing by providing a line characteristic detecting means and a means which evaluates a line based on the detection result and preliminarily determined factors and obtaining coefficients of individual line values by overall evaluation. CONSTITUTION : An air photograph is analyzed into a drawing and is stored as information on a magnetic medium. Line numbers are given based on a road ledger and field investigation to extract information on two-dimensional coordinates, and coordinates of a line are read. The coefficient 1 of street which indicates the use value and the utility based on a width W, the classification, etc., of the line, the coefficient 2 of proximity based on a distance (s) from a station, a hospital, or a pollution source, and the coefficient 3 of curtilage which indicates the use state, the cultural property, etc., of curtilage itself based on the improvement level are calculated in accordance with formulas IWIII. The line value is higher according as the addition value is larger, and line values are standardized and determined with the line value, which has the maximum coefficient of line value in a region, as a constant. Evaluation results are corrected in accordance with transaction examples to evaluate the land on each drawing without contradictions.