Smart watch and control method thereof

A control method of a smart watch, the smart watch including a position sensor unit, a rotation sensor unit and a processor, the method comprising:

• sensing, by the position sensor unit, a position of the smart watch;
• detecting, by the processor using the position sensor unit, whether the smart watch is in a first position or a second position, the first position being when the display unit is worn on a back side of a hand of a user, the second position being when the display unit is worn on a palm side of the hand of the user,
• wherein when the processor detects the first position, a first direction is an outward direction and a second direction is an inward direction, and
• wherein when the processor detects the second position, the first direction is an inward direction and the second direction is an outward direction;
• sensing, by the rotation sensor unit, a rotation direction and a rotation speed of the smart watch;
• detecting, by the processor, a first snap motion and a second snap motion of the smart watch in the detected first or second position,
• wherein the first snap motion is detected when the smart watch rotates on an axis of rotation of the smart watch in the first direction set according to the detected position of the smart watch, at a speed higher than a threshold speed, and
• wherein the second snap motion is detected, when the smart watch rotates on the axis of rotation in the first direction at a speed less than the threshold speed and then rotates on the axis of rotation in the second direction set according to the detected position of the smart watch, at a speed higher than the threshold speed within a predetermined time, the second direction being an opposite direction of the first direction;
• and
• executing, by the processor, a first command corresponding to the first direction when the first snap motion is detected, and executing, by the processor, a second command corresponding to the second direction when the second snap motion is detected.