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A poet expresses his emotion or thought with some materials. A crow and a white heron which contrast in their external color and shape are often compared whin poems by Sijo writers. By the way, the writers' cognition and value-judgement is various, in a case is opposite each other. Such variousness or difference results from their own viewpoint of their social position or the relationship between high and low inborn positions. One poet insists that a person born with low status should be ugly and lack of morality and another poet claims that a person born with high status should be ugly and lack of morality. Such dispute are revived by other writers and denied by writers standing neutral position. And Ji-won, Park, a famous Korean novelist in the period of later middle, asserts another opinion; nobody can overcome his own inborn position and making efforts to retain morality is most important above all. After all, Sijo poet's attitude toward a crow and a white heron is determined his thought of social cosmos.I wish that this study would be help of finding classic values at Sijo texts.

1. I classified the function of caption from the viewpoint of information and made an analysis the character of program in connection with it.2. "Cause, Object, Effect" lie in the mechanism of caption-producing. And those enter the function of caption directly. The differentiation of the functions of caption is affected by them.3. Caption has three major function. The first is "compensation" for insufficiency part of conveyance of information, the second is "substitution" for the carrier of information, and the third is "addition" of information.4. Culture program is apt to use the function of compensation for insufficiency part of conveyance of information, for the purpose of explanation of rapid situation shift which is generated for offering several knowledges. 5. Report program and documentary program, basically, don't have a tendency to use caption. But they used to make practical application of caption as device of compensation for insufficiency part of conveyance of information in case a news source is not a skillful person. 6. Current events program will use the function of compensation for insufficiency part of conveyance of information and that of substitution for the carrier of information, for the rapid situation shift and persuasion the TV audience.7. Entertainment program has a tendency of making the most of the caption in order to amplify enjoyment. Therefore we can easily discover the caption with the function of addition of information.8. This approach and attitude for caption can develope into a tool for verification of that.