A control method of a washing machine including a drum to receive laundry and a motor to rotate the drum to reduce unbalance generated due to the nonuniform distribution of the laundry, the control method characterized by: i) determining (100,200) whether a spin-drying operation is initiated; ii) wrapping (104,204) the laundry by accelerating the speed of the drum by stages such that the laundry sticks to an inner wall of the drum; iii) detecting (106,206) motor current during the wrapping of the laundry; iv) determining (108,208) whether the laundry is in an unbalanced state or a balanced state based on the detected motor current; and v) controlling (114,214) speed of the drum based on the result of the determination, wherein the controlling the speed of the drum includes reperforming only the laundry wrapping operation when it is determined that the laundry is in an unbalanced state, characterized by the further steps of: rotating (102, 202) the drum in alternating directions, such that a laundry untangling process to untangle the tangled laundry is performed, between steps i) and ii), when it is determined that the spin-drying operation is initiated, wherein the speed of the drum includes a first rotation speed at which the laundry does not stick to the inner wall of the drum, a second rotation speed at which the laundry sticks to the inner wall of the drum, the second rotation speed being higher than the first rotation speed, and a third rotation speed at which the laundry starts to stick to the inner wall of the drum, the third rotation speed being between the first rotation speed and the second rotation speed, and wherein the detecting (106, 206) of the motor current includes detecting a magnitude of the motor current when the speed of the drum exceeds the third rotation speed at an operation at which the speed of the drum is accelerated from the first rotation speed to the second rotation speed. i) determining (100,200) whether a spin-drying operation is initiated; ii) wrapping (104,204) the laundry by accelerating the speed of the drum by stages such that the laundry sticks to an inner wall of the drum; iii) detecting (106,206) motor current during the wrapping of the laundry; iv) determining (108,208) whether the laundry is in an unbalanced state or a balanced state based on the detected motor current; and v) controlling (114,214) speed of the drum based on the result of the determination, wherein the controlling the speed of the drum includes reperforming only the laundry wrapping operation when it is determined that the laundry is in an unbalanced state, characterized by the further steps of: rotating (102, 202) the drum in alternating directions, such that a laundry untangling process to untangle the tangled laundry is performed, between steps i) and ii), when it is determined that the spin-drying operation is initiated, wherein the speed of the drum includes a first rotation speed at which the laundry does not stick to the inner wall of the drum, a second rotation speed at which the laundry sticks to the inner wall of the drum, the second rotation speed being higher than the first rotation speed, and a third rotation speed at which the laundry starts to stick to the inner wall of the drum, the third rotation speed being between the first rotation speed and the second rotation speed, and wherein the detecting (106, 206) of the motor current includes detecting a magnitude of the motor current when the speed of the drum exceeds the third rotation speed at an operation at which the speed of the drum is accelerated from the first rotation speed to the second rotation speed. rotating (102, 202) the drum in alternating directions, such that a laundry untangling process to untangle the tangled laundry is performed, between steps i) and ii), when it is determined that the spin-drying operation is initiated, wherein the speed of the drum includes a first rotation speed at which the laundry does not stick to the inner wall of the drum, a second rotation speed at which the laundry sticks to the inner wall of the drum, the second rotation speed being higher than the first rotation speed, and a third rotation speed at which the laundry starts to stick to the inner wall of the drum, the third rotation speed being between the first rotation speed and the second rotation speed, and wherein the detecting (106, 206) of the motor current includes detecting a magnitude of the motor current when the speed of the drum exceeds the third rotation speed at an operation at which the speed of the drum is accelerated from the first rotation speed to the second rotation speed.