A network data-transfer method of transferring data from a server on a network to a network-connected equipment without having a user interface to make the network-connected equipment perform a processing includes relaying an access between the server and a client to represent for the access by the network-connected equipment; creating a transfer-data to be transferred to the client as a response to the access to the server at the relaying by putting a processing data for the network-connected equipment in the transfer-data; and a transfer-data processing by the network-connected equipment, the transfer-data processing including acquiring the transfer-data created at the creating, extracting the processing data from the transfer-data, and processing the processing data extracted.