A printed wiring board design aiding system comprises a first unit which acquires
design layout information regarding a printed wiring board targeted for design,
a second unit which acquires setting parameter information for the printed wiring
board, which is targeted for design, and a third unit which estimates a value of
the thickness of each of insulation layers of the printed wiring board in a post-manufacture
state in accordance with the information acquired by the first unit and the information
acquired by the second unit, and for outputting an estimated value.