A digital multimedia broadcasting accessory apparatus connectable to a mobile terminal, which decodes and reproduces input multimedia data of pre-set format, through an accessory interface of the mobile terminal, comprising: an interface, having a plurality of terminals for connection with the accessory interface of the mobile terminal; a digital multimedia broadcasting signal-receiving unit for receiving the digital multimedia broadcasting data; a digital multimedia broadcasting signal analyzer (308, 704) for extracting multimedia data from the digital multimedia broadcasting data; a digital multimedia broadcasting accessory memory unit for storing conversion information used to convert data formats of the multimedia data into reproducible data formats by the mobile terminal; a data conversion yes/no determiner for requesting the mobile terminal for information on reproducible data formats by the mobile terminal, and determining the data formats used to convert the multimedia data based on the data format information received from the mobile terminal; a digital multimedia broadcasting data converter for converting the data formats of the multimedia data into data formats determined by the data conversion yes/no determiner; and a digital multimedia broadcasting accessory controller (300, 702), in case the digital multimedia broadcasting accessory apparatus is a host, for transmitting the multimedia data to the mobile terminal if data formats of the multimedia data are a reproducible data formats by the mobile terminal, and transmitting the multimedia data converted by the digital multimedia broadcasting data converter to the mobile terminal if data formats of the multimedia data are not a reproducible data formats by the mobile terminal, wherein the digital multimedia broadcasting accessory controller is adapted to apply a logical high-voltage through a pull-up resistor specific voltage to a data terminal of the interface, which is not used to exchange data with the mobile terminal, to allow the mobile terminal to recognize the digital multimedia broadcasting accessory apparatus as the host. an interface, having a plurality of terminals for connection with the accessory interface of the mobile terminal; a digital multimedia broadcasting signal-receiving unit for receiving the digital multimedia broadcasting data; a digital multimedia broadcasting signal analyzer (308, 704) for extracting multimedia data from the digital multimedia broadcasting data; a digital multimedia broadcasting accessory memory unit for storing conversion information used to convert data formats of the multimedia data into reproducible data formats by the mobile terminal; a data conversion yes/no determiner for requesting the mobile terminal for information on reproducible data formats by the mobile terminal, and determining the data formats used to convert the multimedia data based on the data format information received from the mobile terminal; a digital multimedia broadcasting data converter for converting the data formats of the multimedia data into data formats determined by the data conversion yes/no determiner; and a digital multimedia broadcasting accessory controller (300, 702), in case the digital multimedia broadcasting accessory apparatus is a host, for transmitting the multimedia data to the mobile terminal if data formats of the multimedia data are a reproducible data formats by the mobile terminal, and transmitting the multimedia data converted by the digital multimedia broadcasting data converter to the mobile terminal if data formats of the multimedia data are not a reproducible data formats by the mobile terminal, wherein the digital multimedia broadcasting accessory controller is adapted to apply a logical high-voltage through a pull-up resistor specific voltage to a data terminal of the interface, which is not used to exchange data with the mobile terminal, to allow the mobile terminal to recognize the digital multimedia broadcasting accessory apparatus as the host.