Abstract: Disclosed is a framework system improved such that flow of complex business logic for processing a variety of messages may be easily defined and changed without need for programming. Messaging service(s) 15 may relay message(s) between client(s) 11, 13 and framework service(s) 16. Among request message(s) relayed from client(s) 11, 13 to framework service(s) 16 there may be message(s) comprising subject ID(s) associated with subject(s) of such message(s). Framework service(s) 16 may possess a plurality of sets of business logic 22 and flow definition file(s) 23. Flow definition file(s) 23 may comprise a plurality of definition sentences respectively corresponding to various subject IDs, and each such definition sentence may indicate schedule(s) for execution of business logic.