In an information distribution processing system having a plurality of information processing apparatuses connected through a network, at least one of the plurality of information processing apparatuses can acquire distribution information to which is added first additional information as an electronic watermark using a first adding method, and second additional information as an electronic watermark using a second adding method. An extraction unit extracts the first additional information using the first adding method, and an identification unit identifies an information processing apparatus that is able to extract the second additional information, based on the first additional information.