A method of transmitting content from a source device that transmits content to be streamed to a first device and a second device, the method comprising: transmitting a message from the source device to at least one from among a branch device and the second device, the message inquiring whether a conversion function for converting content that is streamed to a first device, is installed on the branch device or the second device; receiving a response at the source device to the transmitted message indicating that the conversion function is installed from at least one from among the branch device and the second device; transmitting a message from the source device requesting conversion of the content to at least one from among the branch device and the second device, which includes the conversion function; and transmitting the content from the source device to the branch device, characterized in that: the branch device is connected between the source device and the first device and the second device, and relays the content from the source device to the first device and to the second device, respectively, and wherein the content is converted by the branch device or the second device based on whether the second device has the conversion function for converting the content, wherein if the content is converted by the branch device then the branch device converts the content and relays converted content to the second device, and if the content is converted by the second device then the branch device relays unconverted content to the second device to be converted by the second device. transmitting a message from the source device to at least one from among a branch device and the second device, the message inquiring whether a conversion function for converting content that is streamed to a first device, is installed on the branch device or the second device; receiving a response at the source device to the transmitted message indicating that the conversion function is installed from at least one from among the branch device and the second device; transmitting a message from the source device requesting conversion of the content to at least one from among the branch device and the second device, which includes the conversion function; and transmitting the content from the source device to the branch device, characterized in that: the branch device is connected between the source device and the first device and the second device, and relays the content from the source device to the first device and to the second device, respectively, and wherein the content is converted by the branch device or the second device based on whether the second device has the conversion function for converting the content, wherein if the content is converted by the branch device then the branch device converts the content and relays converted content to the second device, and if the content is converted by the second device then the branch device relays unconverted content to the second device to be converted by the second device. the branch device is connected between the source device and the first device and the second device, and relays the content from the source device to the first device and to the second device, respectively, and wherein the content is converted by the branch device or the second device based on whether the second device has the conversion function for converting the content, wherein if the content is converted by the branch device then the branch device converts the content and relays converted content to the second device, and if the content is converted by the second device then the branch device relays unconverted content to the second device to be converted by the second device.