Provided is a server device including a risk value acquisition unit that acquires a risk value in a case in which a user's anonymous information leaks and a processing execution unit that associates an anonym ID for identifying the anonymous information with the anonymous information. In a case in which the risk value exceeds a predetermined threshold value, the processing execution unit executes at least any of processing of switching the anonym ID associated with the anonymous information or processing of differentiating anonym IDs associated with a plurality of pieces of division information obtained through division of the anonymous information.