1. A failure diagnosis method of a first apparatus including an inputting unit for inputting biometric data of a user, a storage for storing reference biometric data of the user and a biometric authentication engine for performing authentication by comparison of the biometric data of the user inputted by the inputting unit and reference biometric data of the user stored in the storage, and a display for displaying data, the method comprising: outputting said reference biometric data on the display of the first apparatus; obtaining said reference biometric data outputted on the display of the first apparatus by a second apparatus; inputting new biometric data of the user by using the second apparatus; performing authentication to the first apparatus by comparison of said reference biometric data obtained by the second apparatus from the first apparatus with the new biometric data input using the second apparatus; and determining a cause of a failure of the authentication, and where the determining provides an indication a first message that identifies the inputting unit of the first apparatus as the cause of the failure upon success of the authentication to the first apparatus by the second apparatus, and a second message that identifies said reference biometric data stored in the first apparatus as the cause of the failure upon failure of the authentication by the second apparatus when said reference biometric data obtained from the first apparatus does not match reference data stored in the first apparatus.