A digital device for recognizing a double-sided touch, comprising: a front display unit; a sensor unit configured to detect a touch input and transmit a first input signal based on the detected touch input to a processor; and the processor configured to control the front display unit and the sensor unit, the sensor unit including a grip sensor and a touch sensor, the touch sensor being on a rear surface of the digital device, the grip sensor being configured to generate sensing signals according to the touch pattern of touching fingers and provide the sensing signals to the processor when the user's hand touches opposite first and second side surfaces of the digital device, wherein the processor is configured to: identify an input pattern to the digital device using the first input signal, the input pattern including a grip pattern detected by the grip sensor, determine whether to activate touch sensing on the rear surface of the digital device according to the identified input pattern, provide a touch sensing area on the rear surface of the digital device, when touch sensing on the rear surface of the digital device is activated, wherein the touch sensing area is determined based on at least one of a position of a first point on the first side surface of the digital device and a position of a second point on the second side surface, the first point being an uppermost point among at least one point on the first side surface of the digital device in the identified grip pattern and the second point being an uppermost point among at least one point on the second side surface of the digital device in the identified grip pattern, wherein the first and second points (420, 430) are determined based on the grip pattern, the touch sensing area including an upper area above a line connecting between the first and second points (420, 430), or above a lower point between the first and second points (420, 430), on the rear surface of the digital device, and control content displayed on the front display unit according to a second input signal to the touch sensing area sensed by the touch sensor. a front display unit; a sensor unit configured to detect a touch input and transmit a first input signal based on the detected touch input to a processor; and the processor configured to control the front display unit and the sensor unit, the sensor unit including a grip sensor and a touch sensor, the touch sensor being on a rear surface of the digital device, the grip sensor being configured to generate sensing signals according to the touch pattern of touching fingers and provide the sensing signals to the processor when the user's hand touches opposite first and second side surfaces of the digital device, wherein the processor is configured to: identify an input pattern to the digital device using the first input signal, the input pattern including a grip pattern detected by the grip sensor, determine whether to activate touch sensing on the rear surface of the digital device according to the identified input pattern, provide a touch sensing area on the rear surface of the digital device, when touch sensing on the rear surface of the digital device is activated, wherein the touch sensing area is determined based on at least one of a position of a first point on the first side surface of the digital device and a position of a second point on the second side surface, the first point being an uppermost point among at least one point on the first side surface of the digital device in the identified grip pattern and the second point being an uppermost point among at least one point on the second side surface of the digital device in the identified grip pattern, wherein the first and second points (420, 430) are determined based on the grip pattern, the touch sensing area including an upper area above a line connecting between the first and second points (420, 430), or above a lower point between the first and second points (420, 430), on the rear surface of the digital device, and control content displayed on the front display unit according to a second input signal to the touch sensing area sensed by the touch sensor. identify an input pattern to the digital device using the first input signal, the input pattern including a grip pattern detected by the grip sensor, determine whether to activate touch sensing on the rear surface of the digital device according to the identified input pattern, provide a touch sensing area on the rear surface of the digital device, when touch sensing on the rear surface of the digital device is activated, wherein the touch sensing area is determined based on at least one of a position of a first point on the first side surface of the digital device and a position of a second point on the second side surface, the first point being an uppermost point among at least one point on the first side surface of the digital device in the identified grip pattern and the second point being an uppermost point among at least one point on the second side surface of the digital device in the identified grip pattern, wherein the first and second points (420, 430) are determined based on the grip pattern, the touch sensing area including an upper area above a line connecting between the first and second points (420, 430), or above a lower point between the first and second points (420, 430), on the rear surface of the digital device, and control content displayed on the front display unit according to a second input signal to the touch sensing area sensed by the touch sensor.