In an information processing method for maintaining, in a system in which each of a plurality of processes connected via a network holds and uses shared data to be shared by the processes, consistency of shared data held by the respective processes, when a manipulation request for the shared data is generated, an event indicating that manipulation request is output onto the network. An event as a reply to the event output onto the network is received from the network. A manipulation for the shared data is executed in accordance with the received event. In this way, the manipulation execution timings for shared data to be shared by a plurality of processes can be accurately matched.