1. A member preparation method comprising:a request rank determining step of determining a request member rank of a member fitted to production of a mounting board based on
board information including a mounting position of a component to be mounted on the mounting board, and
component information of the component to be mounted on the mounting board;
a fitting member extracting step of extracting a fitting member fitted to the request member rank determined in the request rank determining step in a plurality of members based on
a production plan of the mounting board, and
retained member information in which a member rank is associated with each of the plurality of the members usable in the production of the mounting board;
a use member selecting step of selecting a use member that is to be used for the production of the mounting board from the fitting member extracted in the fitting member extracting step; and
a member preparation instructing step of generating an instruction to prepare the use member selected in the use member selecting step.