A data relay and information processing method including storing in a database section identification information for identifying language-dependent data and replacement data corresponding to the language-dependent data in association with each other, receiving server data from the server system, detecting the replacement data from the database section on the basis of the identification information contained in the server data, replacing the language-dependent data as contained in the server data by the replacement data, and transmitting the server data as replaced to a client system. Thus, even in the case where the language used in the server system providing a service on the Internet is different from the language used in the client system, it is possible to recognize the information from the server by the client with reference to the replacement data.