A terminal-side communications control unit makes a request to a server for retrieving an instruction file that describes an instruction for transmitting transmission data. The server transmits the instruction file in response to the request for retrieving the instruction file. On receiving the instruction file, the terminal-side communications control unit causes an application executing unit to execute an application, and also forwards the instruction file to a transmission data generating unit. On receiving the instruction file, the transmission data generating part refers to the instruction file to generate, from generated data stored in a generated data storage unit, transmission data to be transmitted to the server.