Disclosed are a method and a mobile terminal for outputting an automatic response message informing a caller of a user's (i.e. recipient's) current schedule when the user is unable to answer an incoming call. The method includes receiving an incoming call, determining whether an automatic response key is pressed to output an automatic response message with implementation of the schedule management function, detecting any schedule information corresponding to the current time by reference to a schedule management table when the automatic response key is pressed, and sending a schedule informing message including the detected schedule information to a caller's terminal.