PURPOSE: To evade regular scattering by temporarily Foulier transforming a filter coefficient of an adaptive digital filter, extracting a component of the same frequency as a reference signal and generating and outputting a drive signal based on the component.

CONSTITUTION: An acceleration sensor 22 as a remaining vibration detection means detecting a vibration condition of a member 35 in the them of acceleration and outputting as a remaining vibration signal e is fixed to the member 35 close to an attaching position of an engine mount 1, and the remaining vibration signal e is supplied to a controller 20 as the signal showing vibration after interference. Then, the controller 20 generates and outputs a drive signal yv based on a reference signal x and the remaining vibration signal ev. In such a case, the filter coefficient Wi of the adaptive digital filter W is Foulier transformed temporarily, and the component of the same frequency as the reference signal x is extracted, and the drive signal yv is generated and outputted based on the extracted component.