A portable device including double-sided displays and a method for controlling the same are provided. The method includes detecting an unlock command for the portable device, which is a command to switch the first display unit to an active state and to switch the second display unit to a ready-to-activate state, switching the first display unit to an active state and switching the second display unit to a ready-to-activate state when the unlock command is the second command, detecting an unlock trigger for the second display unit, which serves to switch a display unit, which is in a ready-to-activate state, to an active state, and switching the second display unit from the ready-to-activate state an active state according to the detected unlock trigger.