1. A computer-implemented word comfort/discomfort index prediction apparatus comprising: a calculation unit embodied on a computer calculating emotional associations between a word and one or more respective comparative words by using a ratio of a probability that the word and the one or more comparative words will independently appear in one paragraph and a probability that the word and the one or more comparative words will simultaneously appear in one paragraph, calculating emotional associations between at least one predefined reference word and the one or more respective comparative words by using a ratio of a probability that the at least one reference word and one or more comparative words will independently appear in one paragraph and a probability that the at least one reference word and the one or more comparative words will simultaneously appear in one paragraph, and calculating an emotional similarity between the word and each of the at least one reference word; and a prediction unit embodied on the computer predicting the comfort/discomfort index of the word by using the at least one emotional similarity and a predefined comfort/discomfort index of the at least one reference word.
3. The word comfort/discomfort index prediction apparatus of claim 1 , wherein the prediction unit predicts the comfort/discomfort index of the word by using an equation given below: P / UNP p = 1 SUM ⁢ ∑ N = 1 N ⁢ ⁢ ( FS n × P / UNP n ) , wherein P/UNPp means the predicted comfort/discomfort index of the word, SUM means a sum total of the emotional similarities between the target word and one or more reference words, n means an index of the reference word, N means the number of one or more reference words, FSn means an emotional similarity of the word and an n-th reference word, and P/UNPn means each of predefined comfort/discomfort indexes of the n-th reference word.