A translation server system of the present invention provides a function of translating a document without feeling any stress irrespective of a performance of a user's own terminal device. A relay device for relaying request data from a terminal device to a server device and response data from the server device to the terminal device in response to the request data, includes a control unit for performing communications with a translation server for translating text information contained in the response data. The translation server translates the text information contained in the response data received from the server device, and a result of this translation is transmitted as response data to the terminal device.