An input apparatus comprising: detection means (8, 9) configured to detect positions upon which a paper medium, disposed in a specified area of the input apparatus, is written by writing means; first acquisition means for acquiring a plurality of first positions, the plurality of first positions being a plurality of positions detected by the detection means (8, 9); first determination means for determining whether a combination and a sequence of acquisition of the plurality of first positions acquired by the first acquisition means satisfy a predetermined first condition; second acquisition means for acquiring a plurality of second positions, the plurality of second positions being a plurality of positions detected by the detection means (8, 9) after the first determination means has determined that the combination and the sequence of the plurality of first positions satisfy the first condition; first storage means storing each of a plurality of second conditions and format information in association with each other, each of the plurality of second conditions indicating a combination and a sequence of a plurality of positions, and the format information identifying a format of a paper medium; second determination means for determining, with reference to first storage means, whether a combination and a sequence of acquisition of the plurality of second positions acquired by the second acquisition means satisfy any of a plurality of second conditions that are stored in the first storage means; and identification means for, in a case where the second determination means has determined that the combination and the sequence of the plurality of second positions satisfy one of the plurality of second conditions, identifying format information associated with the one of the plurality of second conditions. detection means (8, 9) configured to detect positions upon which a paper medium, disposed in a specified area of the input apparatus, is written by writing means; first acquisition means for acquiring a plurality of first positions, the plurality of first positions being a plurality of positions detected by the detection means (8, 9); first determination means for determining whether a combination and a sequence of acquisition of the plurality of first positions acquired by the first acquisition means satisfy a predetermined first condition; second acquisition means for acquiring a plurality of second positions, the plurality of second positions being a plurality of positions detected by the detection means (8, 9) after the first determination means has determined that the combination and the sequence of the plurality of first positions satisfy the first condition; first storage means storing each of a plurality of second conditions and format information in association with each other, each of the plurality of second conditions indicating a combination and a sequence of a plurality of positions, and the format information identifying a format of a paper medium; second determination means for determining, with reference to first storage means, whether a combination and a sequence of acquisition of the plurality of second positions acquired by the second acquisition means satisfy any of a plurality of second conditions that are stored in the first storage means; and identification means for, in a case where the second determination means has determined that the combination and the sequence of the plurality of second positions satisfy one of the plurality of second conditions, identifying format information associated with the one of the plurality of second conditions.