A brain wave interface is started by using a biometric signal of the user, especially a stationary eyesight inducing potential. A brain interface system (1) comprises a biometric signal detecting unit (4) for detecting a brain wave signal of the user (3), a control unit (5) for recognizing the components of the event-related potential included in the brain wave signal and operating a device according to the recognized event-related potential, a starter (2) for starting the control unit (5), and an output unit (6) for presenting a visual stimulation, i.e., blinking at a predetermined frequency according to a signal from the starter (2). The starter (2) has a frequency analyzing unit (7) for analyzing the frequency components of the detected brain wave signal and detecting the strength corresponding to the predetermined frequency and a judging unit (8) for comparing the detected strength with a predetermined threshold and, if the strength is above the predetermined threshold, judging that the user (3) has paid attention to the eyesight stimulation, and starting the control unit (5).
BRAIN WAVE INTERFACE SYSTEM AND STARTER