A technical method related to a server and a client processing multiple sets of channel information is disclosed. Herein, An apparatus of processing multiple channel information according to an exemplary embodiment of the present invention includes a decoder decoding encoded data received from a server, a demultiplexer demultiplexing video data, audio data and metadata for each channel from the decoded data, a controller extracting video data, audio data and metadata for a channel group for on-screen display (OSD) data, the channel group including one or more channels, an OSD generator generating OSD data based on the extracted video data, audio data and metadata for the channel group, and a display module displaying the generated OSD data on a predetermined section along with a broadcast screen of a currently selected channel.
