Abstract: An apparatus for designing roads has an input unit for inputting information of design conditions and/or a command of design processing and so on, an input control unit for controlling the input unit, a design conditions database for storing data such as the information of the design conditions, a road design processing unit for executing road design in accordance with the command of the design processing and/or the information of the design conditions, a result database for storing a data file such as a road design map, an image data processing unit for converting the data file such as the road design map into a suitable output format, an output unit for outputting the road design map as three dimensional computer graphics and/or printer papers and an output control unit for controlling the output unit.