In an effective display area, an additional information recognizing part
203 recognizes a standard of a broadcast wave, refers to a ROM 212 and
selects a target value, and provides an internal clock of a video data
reading part 205 and an internal clock of an OSD data reading part 206
with the target value. At a retrace internal, on the other hand, the
additional information recognizing part 203 notifies an additional
information synthetic position deciding part 210 of the standard of the
broadcast wave. The additional information synthetic position deciding
part 210 selects from a ROM 211 a target value for reading the additional
information applicable to the notified standard, and outputs the target
value to an additional information reading parts 207. When the standard
of the broadcast wave is changed, target values corresponding to the
changes are responsively selected from the ROM 212 and the ROM 211.