In a data providing server, whether or not specified compressed content data generated by means of a specified compression coding method corresponding to terminal identification information has been stored in a content database is detected, according to content specifying data transmitted from a portable dedicated terminal. If the specified compressed content data has been stored, the data providing server reads and transmits this to the portable dedicated terminal. And if the specified compressed content data has not been stored, the data providing server generates the specified compressed content data by means of the specified compression coding method, and transmits this to the portable dedicated terminal.