PROBLEM TO BE SOLVED: To construct a virtual network in which access and authentication to a private network are automated and an authentication server does not need a WEB function and a VPN router function.;SOLUTION: The virtual network construction system includes a small terminal and an authentication server. The small terminal which can be attached to/detached from a client terminal has an identifier transmission section which automatically transmits an identifier to an authentication server through the client terminal, with a connection section connected. The authentication server has: an authentication section which performs authentication on the basis of the identifier of the small terminal; a distribution section which distributes software for enciphering communication to the client terminal according to a selected communication protocol and an encryption method; a receiving section which receives access request information to a target device which is automatically transmitted from the distributed software; and a redirection section which performs proxy response of an access between the client terminal and the target device according to the received access request information.;COPYRIGHT: (C)2014,JPO&INPIT
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