To provide an attribute information supply method with which attribute information of a user possessing a card is safely supplied to the user and convenience of the user can be improved and to provide an attribute information program and an inquiry program for attribute information supply.

A management computer 21 authenticates the user based on an account identifier of an ATM card C received from a CAT terminal 11, and extracts pay-in/out history information on an account of the user. The management computer 21 specifies an enterprise system 40 having recently transferred money to the account of the user recently based on pay-in/out history information and transmits enciphered account information enciphered by using a public key of the user to the specified enterprise system 40. The management computer 21 receives attribute information associated with information matched with enciphered account information transmitted to the enterprise system 40 from the enterprise system 40 in a state where it is enciphered by the public key of the user. The management computer 21 transfers received attribute information to the CAT terminal 11.