A lawn mower robot configured for being operated in a work area defined by a boundary indication unit including a boundary wire ; and comprising: a main body configured to move within the work area defined by the boundary wire , wherein the main body includes: sensing units configured to sense voltage values induced by the boundary wire ; and a controller configured to determine a distance between the main body and the boundary wire from the voltage values sensed by the sensing units , wherein: each sensing unit includes at least two coils differently installed; the two coils are respectively configured to sense voltage values within the same area defined by the boundary wire ; wherein the two coils include: a first coil installed to be wound in the forward direction of the main body; and a second coil installed to be wound in the sideward direction of the main body, and characterized in that the controller is configured to determine the distance by summing the voltage values sensed by the two coils. a main body configured to move within the work area defined by the boundary wire , wherein the main body includes: sensing units configured to sense voltage values induced by the boundary wire ; and a controller configured to determine a distance between the main body and the boundary wire from the voltage values sensed by the sensing units , wherein: each sensing unit includes at least two coils differently installed; the two coils are respectively configured to sense voltage values within the same area defined by the boundary wire ; wherein the two coils include: a first coil installed to be wound in the forward direction of the main body; and a second coil installed to be wound in the sideward direction of the main body, and characterized in that the controller is configured to determine the distance by summing the voltage values sensed by the two coils. sensing units configured to sense voltage values induced by the boundary wire ; and a controller configured to determine a distance between the main body and the boundary wire from the voltage values sensed by the sensing units , wherein: each sensing unit includes at least two coils differently installed; the two coils are respectively configured to sense voltage values within the same area defined by the boundary wire ; wherein the two coils include: a first coil installed to be wound in the forward direction of the main body; and a second coil installed to be wound in the sideward direction of the main body, and characterized in that the controller is configured to determine the distance by summing the voltage values sensed by the two coils. each sensing unit includes at least two coils differently installed; the two coils are respectively configured to sense voltage values within the same area defined by the boundary wire ; wherein the two coils include: a first coil installed to be wound in the forward direction of the main body; and a second coil installed to be wound in the sideward direction of the main body, and characterized in that the controller is configured to determine the distance by summing the voltage values sensed by the two coils. a first coil installed to be wound in the forward direction of the main body; and a second coil installed to be wound in the sideward direction of the main body, and characterized in that the controller is configured to determine the distance by summing the voltage values sensed by the two coils. <EOS>