Active vibration isolating support apparatus

A method includes the steps of: detecting "starter O N" by IG-SW signal (step S12); calculating an moving average value T CRKAVE of crank pulse intervals (steps S13-S17); determining engine starting when the T CRKAVE is less than or equal to a threshold value T th (step S19); and controlling a vibration isolating support unit M based on a natural vibration frequency of the engine when engine starting is determined (steps S20-S22).