An information processing system comprising a communication terminal, a relay device, a first information processing device and a second information processing device, the communication terminal and the relay device being connected to a global network and the first and second information processing devices being connected to different respective local networks (120, 130) which are also connected to the global network, wherein the communication terminal includes: a transmission unit configured to send to the relay device over the global network a process request indicating a first process that the first information processing device is to execute and a second process that the second information processing device is to execute based on an execution result of the first process, the first information processing device includes: a first request transmission unit configured to send the first request over the respective local network and the global network to the relay device; a first process control unit configured to control the first information processing device so as to execute the first process according to the process request sent from the relay device in response to the first request sent from the first request transmission unit; and a transmission unit configured to send to the relay device over the respective local network and the global network the execution result of the first process, which the first process control unit controls the first information processing device to execute, and the process request, and the second information processing device includes: a second request transmission unit configured to send the second request over the respective local network and the global network to the relay device; and a second process control unit configured to control the second information processing device so as to execute the second process based on the execution result of the first process according to the process request sent from the relay device in response to the second request sent from the second request transmission unit. a transmission unit configured to send to the relay device over the global network a process request indicating a first process that the first information processing device is to execute and a second process that the second information processing device is to execute based on an execution result of the first process, the first information processing device includes: a first request transmission unit configured to send the first request over the respective local network and the global network to the relay device; a first process control unit configured to control the first information processing device so as to execute the first process according to the process request sent from the relay device in response to the first request sent from the first request transmission unit; and a transmission unit configured to send to the relay device over the respective local network and the global network the execution result of the first process, which the first process control unit controls the first information processing device to execute, and the process request, and a first request transmission unit configured to send the first request over the respective local network and the global network to the relay device; a first process control unit configured to control the first information processing device so as to execute the first process according to the process request sent from the relay device in response to the first request sent from the first request transmission unit; and a transmission unit configured to send to the relay device over the respective local network and the global network the execution result of the first process, which the first process control unit controls the first information processing device to execute, and the process request, and the second information processing device includes: a second request transmission unit configured to send the second request over the respective local network and the global network to the relay device; and a second process control unit configured to control the second information processing device so as to execute the second process based on the execution result of the first process according to the process request sent from the relay device in response to the second request sent from the second request transmission unit. a second request transmission unit configured to send the second request over the respective local network and the global network to the relay device; and a second process control unit configured to control the second information processing device so as to execute the second process based on the execution result of the first process according to the process request sent from the relay device in response to the second request sent from the second request transmission unit.