A device even at the time of initial planning of plant design easily and rapidly generates three-dimensional arrangement adjustment CAD data which describes a route for arrangement of cable housing components. An area generation section 410 generates a prescribed rectangular parallelepiped area from the minimum and maximum coordinates. A cable information acquisition section 420 acquires information relating to cables such as cable specifications, starting point information, and end point information. A route generation section 430 generates a cable housing component route between a starting point area and an end point area through via areas. A route consolidation section 440 consolidate into a single route any route having the same cable specification, starting point information, via information, and end point information. A three-dimensional model conversion section 480 adds a prescribed width and height to the consolidated route to generate a three-dimensional cable housing component route model.