An information processing system includes a first process, a second process, a management process and a relay process. The first process executes a predetermined process and communicates with other processes. The second process is started in response to a start request sent from the first process and executes a predetermined process. The management process manages communication between the first process and the second process. The relay process receives, from the first process, the start request to the second process and usage data used in the first process and the second process. The relay process further starts the second process by proxy, transfers the usage data to the second process, and notifies the management process of the start of the second process.