The present invention provides an identification method. A video capture device captures an identification video at a random time. Then a suitable identification image is obtained from the identification video. Subsequently, a current user characteristic value obtained from the identification image is compared with a stored user characteristic value of a user data stored in a recognition database. When the current user characteristic value corresponds to the stored user characteristic value, then returns to capture the identification video step. When the current user characteristic value does not corresponds to the stored user characteristic value, then an error counter is incremented, and returns to the acquiring the identification video step.