A method of controlling an apparatus including a display and a sensor for obtaining biometric data of a user, the sensor being movable to take a plurality of angular positions with respect to the apparatus, includes storing a plurality of sets of reference information in association with the positions of the sensor, respectively, determining which one of the angular positions which the sensor is currently taking, displaying on the display a direction as to which one of bodily parts is to be used in accordance with the current angular position of the sensor to urge a user to input biometric data of the one of the bodily parts by the sensor, and carrying out authentication of the user by comparing the inputted biometric data with one of the sets of reference information corresponding to the current angular position of the sensor.