Abstract: An automatic wiring device for deriving the shortest distance wiring route in a short time, in designing a semiconductor integrated circuit. First, based on the coordinate positions of respective signal terminals and the coordinate positions of respective channel wiring areas of respective lines, the X-coordinate positions of all of the partial wiring routes ay1, ay2 . . . , by1, by2 . . . , ayr2, byr2, ayr3, byr3 extending in the Y-direction are determined. Then, based on the positional relations among respective partial wiring routes extending in the Y-direction in respective interlinear wiring areas, the Y-coordinate positions of all of the partial wiring routes ax1-2-3, bx1-2-3, axr2-4-r3, bxr2-r3, axr3-5-6, bxr3-3-4 extending in the X-direction are determined. By these determinations, the wiring routes WA, WB for connecting the signal terminals of respective groups, in a network form, with the shortest distance, are determined.