Apparatuses and methods are provided for executing a function corresponding to a handwritten user input at the same time as providing a handwritten unlock command on a lock screen of an electronic device. The apparatus includes a touch screen that displays a lock screen including a first layer for unlocking the lock screen and a second layer that is laid over the first layer, and a controller that verifies that an unlock command is the same as a predetermined unlock command in response to the unlock command being input to the first layer, to display the second layer in response to the unlock command being the same as the predetermined unlock command, and to search for a command corresponding to a handwritten user input that is input to the second layer to execute the command.