An image system includes a digital broadcasting processing apparatus and a remote controller for remotely controlling the digital broadcasting processing apparatus, wherein the remote controller includes a mode switching button for selecting one of a major channel mode and a minor channel mode, a channel search button for sequentially searching major channels and minor channels depending on the selected channel mode, and a radio transmitter which wirelessly transmits information about selection of the mode switching if the mode switching button is selected or information about a searched channel if the channel search button is selected, to a radio receiver. Further, the digital broadcasting processing apparatus includes the radio receiver which wirelessly receives the information and a channel controller which switches a channel mode tuned based on the information on the selection of the mode switching.