A mobile terminal and an operation control method thereof in which a delay time of the screen lock execution is controlled according to the type of application, are discussed. The mobile terminal according to an embodiment of the present disclosure may include an input unit configured to receive a user input; an execution controller configured to execute screen lock if the user input is not received for a first delay time; and a change controller configured to extend the first delay time to a second delay time based on the user's gaze information.