A method for quickly executing an application on a lock screen in a mobile device is provided. The method includes displaying a lock screen on which a plurality of executable objects are displayed; receiving an unlock command by an input means; determining whether the received unlock command coincides with a preset unlock command; unlocking the lock screen if the received unlock command coincides with the preset unlock command; and executing an application associated an object corresponding to a last position of the input means. By doing so, the mobile device may quickly execute an application upon unlocking.