An information processing method maintains, in a system in which each of a plurality of client processes connected via an information transmission medium holds and uses shared data to be shared by the plurality of client processes, consistency of shared data held by the respective plurality of client processes. The method includes an input step of inputting a manipulation request, a determining step of determining a mode corresponding to the input manipulation request, from a plurality of modes including a first mode and a second mode, and a processing step of executing a process corresponding to the manipulation request in accordance with the mode determined in the determining step. The processing step includes a sending step of sending, when the manipulation request requests a manipulation of the shared data, request information that represents the manipulation request to a server process, a reception step of receiving response information corresponding to the request information sent in the sending step, from the server process, and a manipulation execution step of executing a manipulation for the shared data in accordance with the manipulation request or the response information received in the reception step.