To make same person possession determination of a plurality of terminals highly accurate.SOLUTION: A determination device 20 has: a storage unit 24 which stores wearing position templates indicating time series sensor information from a terminal according to wearing positions for each owner; a wearing position determination unit 252 which acquires the time series sensor information in the plurality of terminals and identification information of the owner who owns the plurality of terminals, refers to the wearing position templates of respective wearing positions corresponding to the owner who owes the plurality of terminals from the storage unit on the basis of the identification information of the owner, compares acquired each sensor information and the wearing position templates of referred respective wearing positions, and determines the wearing positions of the plurality of terminals respectively on the basis of the comparison resu and a same person determination unit 253 which corrects each sensor information acquired according to the wearing position of each terminal respectively, and determines whether or not the plurality of terminals are owned by a same person on the basis of corrected each sensor information.SELECTED DRAWING: Figure 1
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