Digital device and control method thereof

A control method of a digital device, the method comprising:

• obtaining a first reference position and a second touch position on a front-side touch sensor unit or a rear-side touch sensor unit;
• obtaining a distance between the first reference position and the second touch position;
• and
• determining whether or not the distance between the first reference position and the second touch position is within a valid recognition distance,
• wherein the valid recognition distance with respect to the rear-side touch sensor unit is longer than the valid recognition distance with respect to the front-side touch sensor unit.

A digital device comprising:

• a display unit configured to display a visual object;
• a front-side touch sensor unit configured to sense a touch input on a front side of the digital device;
• a rear-side touch sensor unit configured to sense a touch input on a rear side of the digital device;
• and
• a processor configured to control the display unit, the front-side touch sensor unit, and the rear-side touch sensor unit,
• wherein the processor is further configured to:
• recognize a first touch and a second touch, obtained via one touch sensor unit among the front-side touch sensor unit or the rear-side touch sensor unit, as a single double-touch gesture or as separate touch inputs according to position and time of the first touch and the second touch,
• wherein if a distance between positions of the first touch and the second touch is within a valid recognition distance and a time interval between the first touch and the second touch is within a valid recognition time interval, recognize the first touch and the second touch as the single double-touch gesture,
• wherein the valid recognition distance with respect to the rear-side touch sensor unit is longer than the valid recognition distance with respect to the front-side touch sensor unit.