1. A word comfort/discomfort index prediction apparatus comprising: a calculation unit calculating emotional associations between the word and one or more respective comparative words, calculating emotional associations between at least one predefined reference word and the one or more respective comparative words, and calculating an emotional similarity between the word and each of the at least one reference word; and a prediction unit 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.