Disclosed is a portable device including a first camera unit configured to capture a first image and a second camera unit configured to capture a second image; a communication unit configured to transmit and receive data to and from an external device; and a processor configured to control the first camera unit, the second camera unit, and the communication unit, wherein the processor is further configured to: detect a state of a third camera unit contained in the external device when activating at least one of the first camera unit and the second camera unit, the state of the third camera unit including an active state and an inactive state, detect a direction of the third camera unit when the third camera unit is in the active state, and activate at least one of the first camera unit and the second camera unit in a different direction from the detected direction of the third camera unit.