A portable device and a method for controlling the same are discussed. The portable device comprises a double sided display unit including a first display screen on a front side and a second display screen on a back side; a first touch sensor unit and a second touch sensor unit configured to respectively sense a first touch input for the first display screen and a second touch input for the second display screen; and a processor configured to: switch the second touch sensor unit to a ready-to-active state activating temporarily the second touch sensor unit for a predetermined period when the first touch input for the first display screen is sensed, and switch the second touch sensor unit to an active state when the second touch input for the second display screen is sensed within the predetermined period.