The invention is to provide an abnormality determination apparatus, an abnormality determination system, an abnormality determination method and a storage medium, which can simply detect an abnormality of a temperature in a machine tool without incurring cost. The abnormality determination apparatus (1) which determines abnormality of a temperature sensor (7) in a plurality of machine tools (4), in which the plurality of machine tools is equivalent machine type, is arranged in equivalent environments, are provided with a temperature sensor (7) at equivalent positions, and perform equivalent processing at the same moment, the abnormality determination apparatus including: a temperature data acquisition unit (11) which acquires temperature data outputted by the temperature sensors (7) from each of the plurality of machine tools (4); a comparison unit (12) which compares the temperature data acquired by the temperature data acquisition unit (11); and an abnormality determination unit (13)which determines abnormality of the temperature sensor (7) based on a comparison result by the comparison unit (12).