An information processing system includes at least two terminals connected with a first network; and an information processing apparatus (IPA) connected with a second network, and with the first network via a relay device. The first terminal obtains device information about devices on the second network, receives a selection among the devices, and transmits a request for outputting data on the selected device to the IPA. The second terminal obtains the device information, receives the selection of the device, transmits a request for obtaining data on the selected device to the IPA, and obtains the data output by the selected device. The IPA obtains the requests for the outputting and the obtaining, respectively, requests the selected device to execute the outputting and the obtaining, receives the data provided by the selected device, to provide it to the second terminal.