Abstract: When an application server for performing a Web application is developed, a framework describing each of the modules of data, a logic, and a screen is provided. To attain this, the input contents of a Web page are converted into a data object, the combination of the type of the data object and a command is mapped in each process routine using a first foreign definition file, a process routine to be executed is determined from among prepared process logics based on the type of the data object, the command, and the first foreign definition file, and the combination of an execution result of the process logic and the type of the displaying data object is mapped in the displaying component using a second foreign definition file. These files are provided in the application server.

Abstract: A state transition definition table describes state transition definitions. A state transition table generation class is generated from the state transition definition table. A state transition management module controls the state transition of screens utilizing a state transition table generated from a state transition table generation class, based on the input of events derived from screens. A state transition management module controls the display of screens based on the state transition thereof.

Abstract: In a distributed client-server system a client is connected to an arbitrary server using a communication module common to a plurality of servers and it uses data, etc. of each server by switching over its connection. At this time basically there is no need for communication and the replication of data between the servers.