1. A selection set evaluation device, by which a selection set constituted of one selection item or a plurality of selection items selected by a selecting user is evaluated by another user wherein each selection item representing a commercial product constituting a product set, and the selecting user selects the selection item subjectively freely according to a specific theme, comprising: selection item memory storing information concerning the selection item; selection item display indicator for indicating the selection item to a selecting user; selection item selecting input device by which the selecting user selects the selection item, that has been indicated, so as to make the selection set; selection set display indicator for indicating the selection set, that has been made by the selecting user, to a plurality of evaluating users; and evaluation input area by which each of the evaluating users inputs an evaluation of the selection set that has been indicated, the evaluation is the evaluation user's subjective evaluation about how excellent the selection set is as a representation of the specific theme.