A drive controller for a lens apparatus including a first lens unit which
moves for changing magnification and a second lens unit which moves to
prevent an image plane variation in response to the first lens unit
moving to change the magnification. The drive controller includes a
memory storing a plurality of tracking data corresponding to position
data of the second lens unit, and a control unit for detecting a change
in a focus state of the lens apparatus during the movement of the first
lens unit and for changing one of the plurality of tracking data based on
the detection result. The control unit stores a direction of the changing
of the one tracking data and thereafter changes the one tracking data
based on the stored direction.