To easily select a mask maker according to a plurality of factors.

This mask maker selecting method includes a step (S514) for storing bid data received from a mask maker, a step for correcting the answer delivery date included in the received bid data into a corrected delivery date according to the delivery achievement rate of a last month, a step for storing priority regarding delivery, priority regarding technology, priority regarding order reception, and priority regarding a price, a step (S518) for reading delivery dates by bidding mask makers to an inputted article number when the number of the article to be ordered is inputted, a step (S522) for calculating the total evaluations by the mask makers according to a plurality of the priority values, and a step (S524) for selecting the mask maker having the highest total evaluation as an ordering destination.