To reuse a manufactured frequency selection board.

Provided is a stage of adding, to respective element patterns 11, new conduction parts 11a which is electrically connected to the element patterns 11 of a frequency selection board 10 to be corrected, for example, a stage of adding the new conduction parts 11a by preparing and putting a mask 12 for correction which has holes 12a made to correspond to the new conduction parts 11a and overlapping the mask 12 over the frequency selection board 10, and then printing or applying a conductive material through the holes 12a of the mask 12 for correction.