Electric apparatus and control method therefor

An electric apparatus for controlling movement of an object, comprising:

• a detection unit configured to detect the movement of the object;
• a first estimation unit configured to estimate, based on a detection signal output from the detection unit, a control quantity for performing first feedback control for the object at a first period;
• a timing signal generation unit configured to generate, based on the detection signal output from the detection unit, a timing signal for estimating a state quantity of the object in order to perform second feedback control for the object at a second period shorter than the first period;
• a second estimation unit configured to estimate the state quantity based on the timing signal generated by the timing signal generation unit;
• a first generation unit configured to generate, based on the control quantity estimated by the first estimation unit, a first operation quantity for the first feedback control;
• a second generation unit configured to generate, based on the state quantity estimated by the second estimation unit, a second operation quantity for the second feedback control;
• and
• a synthesizing unit configured to generate an operation quantity of the object from the first operation quantity and the second operation quantity.