Disclosed here is an integrated application system for enabling a new application to be added and a user to select an optional application easily. The integrated application system includes a plurality of clients for receiving services from a plurality of application servers for supplying a plurality of services and a management apparatus for controlling services supplied by the application servers to the clients according to an integrated service starting request from any of clients. Each of the clients includes a client management unit for controlling participation of a plurality of application clients corresponding to a plurality of services in an integrated service. The client management unit selects each application used in the integrated service and a client that participates in the integrated service respectively and sends an integrated service starting request to the management apparatus while the management apparatus instructs each of the selected application servers to start a service according to the integrated service starting request from the client management unit.