Information processing system and information processing method

An information processing system, comprising:

• circuitry configured to:
• acquire act information that indicates occurrence of a first act of a plurality of acts from a first user to a second user;
• accumulate information associated with the first user, the second user, and a type of act of each of the plurality of acts in order of occurrence of the plurality of acts, wherein
• the first user performs the first act, and
• the second user is influenced by the first act;
• determine a second act from the plurality of acts based on an influence of the second act on the first act and the influence of the second act on the first user;
• control recordation of the first act in association with the second act based on the determined second act;
• trace associated acts of the plurality of acts in order from the first act, wherein the associated acts are traced based on information that indicates association between the plurality of acts;
• generate a control signal to notify the second user, wherein
• the control signal is generated based on inclusion of a third act of the plurality of acts, and
• the third act is performed by the second user;
• and
• control transmission of the generated control signal to a client device that corresponds to the second user.