1. A device for confirming a validity of result of clinical examination of a part of a subject for a clinical examination, the device comprising: a computer including: a receiving, unit configured to receive a pattern of present data for a subject that is clinical data of a part obtained this clinical examination and a pattern of previous data for the subject that is clinical data of the part obtained last clinical examination; a storing unit configured to store a plurality of reference patterns, the reference patterns being classified into a plurality of levels and being arranged two-dimensionally; a selecting unit configured to select, from the plurality of reference patterns, a first reference pattern best matching with the pattern of present data and a second reference pattern best matching with the pattern of previous data; a calculating unit configured to calculate a value, the value being indicative of a distance between a position of the first reference pattern and a position of the second reference pattern in the plurality of reference patterns arranged two-dimensionally; and a determining unit configured to determine a validity of the present data for the subject based on the value, by comparing the value to a predetermined threshold value.