A distributed processing system wherein client-side process is simplified and system reliability is improved. An information transmission requesting section makes a request for transmission of information, and an information providing section provides received information to a user. An information management section manages the information, and an information relaying/transmitting section relays the information to be transmitted to a client application. An account authentication section verifies authenticity of account of the client application, and an information storage section stores the information. After the authenticity is verified, a service application control section controls the start and termination at logon and logoff, respectively, of a service application corresponding to the client application.