To easily analogize a set password, even when a user forgets the set password, and to hardly derive it by other party.

A storage part 5 stores the set password, and an auxiliary password comprising a pattern correlated with the set password. A display input part 3 displays an array of a plurality of code display areas indicating a code of a kind same to that of a code for forming the set password, and receives an input of a password by a selection operation of the code display areas. A password collating part 7 collates the input password with the set password, and outputs authentication information when both are determined to be consistent each other. A starting-up control part 11 controls starting-up of electronic equipment, based on the authentication information. A display changing part 9 changes an array of the code for forming the code display area along a pattern shape of the auxiliary password, when no input password is determined to be consistent with the set password, and displays and controls the display input part 3.

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