A user interface method and corresponding device, where the user interface method includes waiting for detection of an event, which is a function of the user interface device, performing the event detection in the user interface device and notifying a user that the event has been detected, activating a voice input unit configured to allow the user to input his or her voice therethrough, receiving a voice command from the user with respect to the event through the voice input unit, and processing a function according to the received voice command from the user, including repeated output of an audible signal or a visual display or a vibration to notify the user when the command had not been received.