An information processing system includes: a server apparatus to manage an application; and an electronic device to communicate with the server apparatus via a network, the electronic device having a web browser for displaying a web page provided by the server apparatus. The server apparatus includes circuitry to: receive registration of an application having customized a display screen; cause the display screen of the application to be displayed within a frame of the web page; and in response to an input to the display screen displayed within the frame, receive a request for executing at least one function of the information processing system from a script outside the frame, via an interface for providing the at least one function of the information processing system, and control execution of the at least one function.