An information processing device comprising: a chassis with a front surface and a back surface, wherein the chassis extends in a width direction, a height direction and a depth direction; a display section on the front surface of the chassis; a front touch sensor that overlaps the display section and is adapted to detect a position of an object on a front detection surface of the front touch sensor; a back touch sensor on the back surface of the chassis that is disposed opposed to the front touch sensor and adapted to detect a position of an object on a back detection surface of the back touch sensor; and a control section being connected to the front touch sensor and the back touch sensor via an input interface, characterized in that the control section is adapted to identify, as a prohibited area, one of two areas that each occupy a part of the display section and are disposed on a lower left or lower right area of the display section based on at least one detected position by the back touch sensor, said at least one detected position determines whether the information processing device is grasped by a left or right hand of a user, the prohibited area being set as the area that is hidden by the other operating hand of the user, and the control section is adapted to cause information as a display target to be displayed in one or more priority areas (54-1, 54-2, 54-3) outside the prohibited area in the display section, and wherein a correspondence relationship between the detected position by the back touch sensor and the prohibited area identified from the two areas is changed depending on a determination by an orientation detector that is adapted to determine whether a user grasps the device laterally along the height direction being associated to a shorter-side direction of the display section or longitudinally along the width direction being associated to a longer-side direction of the display section. a chassis with a front surface and a back surface, wherein the chassis extends in a width direction, a height direction and a depth direction; a display section on the front surface of the chassis; a front touch sensor that overlaps the display section and is adapted to detect a position of an object on a front detection surface of the front touch sensor; a back touch sensor on the back surface of the chassis that is disposed opposed to the front touch sensor and adapted to detect a position of an object on a back detection surface of the back touch sensor; and a control section being connected to the front touch sensor and the back touch sensor via an input interface, characterized in that the control section is adapted to identify, as a prohibited area, one of two areas that each occupy a part of the display section and are disposed on a lower left or lower right area of the display section based on at least one detected position by the back touch sensor, said at least one detected position determines whether the information processing device is grasped by a left or right hand of a user, the prohibited area being set as the area that is hidden by the other operating hand of the user, and the control section is adapted to cause information as a display target to be displayed in one or more priority areas (54-1, 54-2, 54-3) outside the prohibited area in the display section, and wherein a correspondence relationship between the detected position by the back touch sensor and the prohibited area identified from the two areas is changed depending on a determination by an orientation detector that is adapted to determine whether a user grasps the device laterally along the height direction being associated to a shorter-side direction of the display section or longitudinally along the width direction being associated to a longer-side direction of the display section.