A mobile device configured to display at least one application executed in the first mode and the second mode respectively; a sensor unit configured to sense a user input for the mobile device; and a processor configured to: provide an unlock interface to unlock a lock state of the first mode or the second mode, display at least one application executed in the first mode and maintain the second mode in the lock state when the mobile device unlocks the first mode and enters into the first mode through the unlock interface, detect an event for the second mode in the first mode even though the second mode is in the lock state, indicate information related to the event for the second mode in the first mode, and process the event when the mobile device unlocks the second mode and enters into the second mode through the unlock interface.