3. A digital broadcast receiver comprising: a video output that provides an image, video data and caption data each extracted from received digital broadcast signals to a monitor; an audio output that provides as audio, audio data extracted from the received digital broadcast signals to a speaker; and a controller that selects caption data representing captions in a certain language from the extracted caption data on the basis of a language designated by a user for caption output so as to cause the monitor to display captions based on the selected caption data; selects audio data representing audio in a certain language from the extracted audio data on the basis of a language designated by a user for audio output so as to cause the speaker to output audio based on the selected audio data; and sets a first and second designated language for both the language designated for caption output and the audio output, the first and second designated languages each having an associated priority, wherein the controller compares the designated language with languages in which captions are available from the caption data extracted from the digital broadcast signals, and when the designated language is included in the languages in which the captions are available from the extracted caption data, the caption data representing captions in the designated language is selected, wherein the controller compares the designated language with languages in which audio is available from the audio data extracted from the digital broadcast signals, and when the designated language is included in the languages in which the audio is available from the extracted audio data, the audio data representing audio in the designated language is selected, compares the first and second designated languages with languages in which captions are available from the caption data extracted from the digital broadcast signals, and when some or all of the designated languages are included in the languages in which the captions are available, caption data representing captions in one of the some or all of the designated languages that has a highest priority is selected, and when none of the designated languages is included in the languages in which the captions are available, caption data representing captions in a most universal language among the languages in which the captions are available is selected, compares the first and second designated languages with languages in which audio is available from the audio data extracted from the digital broadcast signals, and when some or all of the designated languages are included in the languages in which the audio is available, audio data representing audio in one of the some or all of the designated languages that has a highest priority is selected, and when none of the designated languages is included in the languages in which the audio is available, audio data representing audio in a most universal language among the languages in which the audio is available is selected, and determines a match between the first and second designated languages and the languages in which the captions or audio is available from the extracted caption or audio data as well as universality of a language based on numbers of language codes.
3. A digital broadcast receiver comprising: a video output that provides an image, video data and caption data each extracted from received digital broadcast signals to a monitor; an audio output that provides as audio, audio data extracted from the received digital broadcast signals to a speaker; and a controller that selects caption data representing captions in a certain language from the extracted caption data on the basis of a language designated by a user for caption output so as to cause the monitor to display captions based on the selected caption data; selects audio data representing audio in a certain language from the extracted audio data on the basis of a language designated by a user for audio output so as to cause the speaker to output audio based on the selected audio data; and sets a first and second designated language for both the language designated for caption output and the audio output, the first and second designated languages each having an associated priority, wherein the controller compares the designated language with languages in which captions are available from the caption data extracted from the digital broadcast signals, and when the designated language is included in the languages in which the captions are available from the extracted caption data, the caption data representing captions in the designated language is selected, wherein the controller compares the designated language with languages in which audio is available from the audio data extracted from the digital broadcast signals, and when the designated language is included in the languages in which the audio is available from the extracted audio data, the audio data representing audio in the designated language is selected, compares the first and second designated languages with languages in which captions are available from the caption data extracted from the digital broadcast signals, and when some or all of the designated languages are included in the languages in which the captions are available, caption data representing captions in one of the some or all of the designated languages that has a highest priority is selected, and when none of the designated languages is included in the languages in which the captions are available, caption data representing captions in a most universal language among the languages in which the captions are available is selected, compares the first and second designated languages with languages in which audio is available from the audio data extracted from the digital broadcast signals, and when some or all of the designated languages are included in the languages in which the audio is available, audio data representing audio in one of the some or all of the designated languages that has a highest priority is selected, and when none of the designated languages is included in the languages in which the audio is available, audio data representing audio in a most universal language among the languages in which the audio is available is selected, and determines a match between the first and second designated languages and the languages in which the captions or audio is available from the extracted caption or audio data as well as universality of a language based on numbers of language codes. 4. The digital broadcast receiver according to claim 3 , wherein the controller causes a designated language setting screen, on which names of a plurality of languages selectable as a designated language are displayed with a cursor to be moved among the displayed language names, to appear on the monitor so that two or more designated languages having different priorities are set based on an operation of the cursor by a user.