One digital broadcasting system is capable of providing additional information and HD (high-resolution) upconverter, is provided to more variable informations thus by broadcast, by in HD image is converted a blank such as advertisement that generates additional information is provided. One SD (standard definition) AV broadcasting units (106) transmission SD broadcast. One additional information controller (102) additional information transmission. One HD upconverters receive SD broadcast from SD AV broadcasting units, convert the SD broadcast being received upwards and enter a HD image, an image are generated, wherein the HD image and additional information converted upwards are synthesized. HD upconverters are generated by using blank area synthesis additional information, when conversion SD broadcast enters HD image.
展开▼
