An aerosol generating system includes a holder generating aerosol by heating a cigarette, and a cradle having an inner space into which the holder is inserted, wherein the holder is electrically connected to the cradle to be moveable in the inner space of the cradle. The aerosol generating system includes a controller and a heater for heating an aerosol generating material, wherein the controller predicts insertion of the cigarette into the holder and preheats the heater in advance based on a prediction result.
