To provide enjoyment of a purchasing act with a friend such as in shopping at a real store in Web service represented by the conventional electronic store.

A purpose of this system is achieved by recording, acquiring action information applicable to a business processing request transmitted from a client via a processor 100 in a processor 110, recording, acquiring shared session information in order to manage sharing of the action information, managing participation in the shared session, transmitting action information about users who participate in the shared session to client terminals of all the users who participate in the shared session in a processor 120, and displaying screens according to the transmitted action information on client devices.