Authentication system

摘要

An authentication apparatus avoiding illegitimate authentication procedures performed based on illegitimately acquired personal ID information of other parties is provided. An authentication apparatus 50 receives personal ID information ID1 of an orderer 31, personal ID information ID2 of a vendor 33, and transaction information by an authentication request from an orderer terminal 11, communicates with a vendor terminal 15, then transmits authentication information indicating a legitimacy of the vendor 33 to the orderer terminal 11.