A display controller displays an image of a high resolution output from 13-Segment decoder on a main screen area of a display unit and displays an image of the standard resolution output from a single-Segment decoder on a subsidiary screen area of the display unit. When an instruction is entered from a user I/F to switch television broadcasts displayed respectively on the main screen area and on the subsidiary screen area of the display unit, a control unit instructs the display controller to display a still image of the standard resolution output from the single-Segment decoder on the main screen area until an image of a high resolution of the switched television broadcast is output from 13-Segment decoder.