There is provided a gripping-feature learning authentication system capable of preventing impersonation. A mobile information terminal includes a trigger monitoring part outputting a gripping-feature acquisition signal, a gripping-feature sample acquisition part acquiring a gripping-feature sample, a template learning part learning a user authentication template, a template sending part sending the user authentication template, an authentication request sending/receiving part sending and receiving an authentication request, an authentication data sending part sending a terminal identification number or a gripping-feature sample, and a determination result receiving part receiving a determination result. A server includes a template receiving part receiving a user authentication template, a member template storage storing a user authentication template and member information, an authentication data receiving part receiving a terminal identification number and a gripping-feature sample, a member authentication part determining the probability that users corresponding to terminal identification numbers and gripping-feature samples belong to the same member group, and a determination result sending part sending a result of the determination.
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