A method provides an expression picture in an instant communication conversation window; acquires information of a user operation activity information from a sending user with respect to the expression picture; searching a first expression database based on the expression picture and the acquired information of the user operation activity; generates a first response message corresponding to the expression picture under the user operation activity; and sends found information related to the expression picture and the acquired information of the user operation activity to a receiving client corresponding to a receiving user to facilitate the receiving client to generate a second response message corresponding to the expression picture under the user operation activity.