Abstract: A class changing apparatus includes a link unit configured to be linked with a client device to transmit and receive data. The class change apparatus also includes a storage unit configured to store apparatus information including class information of the client device. The class changing apparatus further includes a control unit coupled to the link unit and the storage unit and controlling operations of the class changing apparatus including a class changing operation, wherein the class change operation includes transmitting at least one command including a command for rebranching into the selected class to the client device through the link unit and registering class information as changed class information in the storage unit in response to detecting a class change request.

Abstract: A class changing apparatus includes a link unit configured to be linked with a client device to transmit and receive data. The class change apparatus also includes a storage unit configured to store apparatus information including class information of the client device. The class changing apparatus further includes a control unit coupled to the link unit and the storage unit and controlling operations of the class changing apparatus including a class changing operation, wherein the class change operation includes transmitting at least one command including a command for rebranching into the selected class to the client device through the link unit and registering class information as changed class information in the storage unit in response to detecting a class change request.

Abstract: A data file reproducing method for a personal terminal which can include providing a data file by connecting a data supplying server to a communication network, selecting a data file, connecting the data supplying server to a personal terminal, transferring the selected data file to the personal terminal, and storing automatically the transferred data file in the personal terminal. A data reproducing apparatus for a personal terminal which can include a wireless transceiver that can transfer and receive data files to and from a mobile communication network, a storage device, a controller, a decoder and a reproducing unit.

Abstract: A data file reproducing method for a personal terminal which can include providing a data file by connecting a data supplying server to a communication network, selecting a data file, connecting the data supplying server to a personal terminal, transferring the selected data file to the personal terminal, and storing automatically the transferred data file in the personal terminal. A data reproducing apparatus for a personal terminal which can include a wireless transceiver that can transfer and receive data files to and from a mobile communication network, a storage device, a controller, a decoder and a reproducing unit.

Abstract: A data file reproducing method for a personal terminal which can include providing a data file by connecting a data supplying server to a communication network, selecting a data file, connecting the data supplying server to a personal terminal, transferring the selected data file to the personal terminal, and storing automatically the transferred data file in the personal terminal. A data reproducing apparatus for a personal terminal which can include a wireless transceiver that can transfer and receive data files to and from a mobile communication network, a storage device, a controller, a decoder and a reproducing unit.