Provided is a method and apparatus for controlling the precision of the rotation angle of a rotation of a dynamic apparatus, including the step of determining a conversion factor of a gyroscope installed in the dynamic apparatus to control the rotary movement to be a first conversion factor; a first step of measuring an output angular velocity in the case of applying a predetermined test operation to the gyroscope; a second step of measuring a second conversion factor based on the test operation and the output angular velocity corresponding to the test operation; a third step of computing an error between the first conversion factor and the second conversion factor; and a fourth step of updating the first conversion factor of the gyroscope by the second conversion factor in the case the error is more than a predetermined standard value, wherein in the case the dynamic apparatus is on standby or an operation command with respect to a predetermined operation is inputted, the first through fourth steps are performed before the operation is performed.