Abstract: A wiring device and wiring method suitable for designing LSIs or printed boards or the like. The wiring device includes a wiring pattern editing unit for editing wiring patterns; a noise analyzing unit for analyzing a noise occurring when a circuit is operated according to the wiring patterns edited by the wiring editing unit; and a noise occurring spot specifying unit for specifying a spot when noise occurs in the wiring pattern, based on the solution analyzed by the noise analyzing unit and the wiring pattern edited in the wiring pattern editing unit The man-hours of an operator can be reduced by interlocking the crosstalk noise analysis with the wiring pattern editing function and then by reducing the number of man-hours needed to correct a wiring pattern by an operator.