A wiring route deciding system, for a wiring board containing a multi-pin part, includes an input unit for receiving wiring board and wire connection information, wiring constraint information and wiring setting information, for example. The system further contains a draw wiring processing unit which decides a wiring route of a draw wiring from a part pin to a part periphery boundary based on wiring information inputted by the input unit, an inter-draw wire wiring processing unit which decides the wiring route taken between end points of the draw wiring decided by the draw wiring processing unit, and an output unit which outputs a wiring route information based on that decided by both the draw wiring processing unit and the inter-draw wire wiring processing unit. There is also provided a method counterpart for a wire routing scheme for a wiring board containing a multi-pin part.