1. A method for adding hyperlink for text, comprising: creating a hyperlink word list in advance, the hyperlink word list comprising a plurality of hyperlink words; collecting a variety of texts, and generating a characteristic word list by implementing word segmentation processing for each of the texts, the characteristic word list comprising a plurality of characteristic words; for each of the characteristic words, computing a co-occurrence frequency between each of the characteristic words and each of the hyperlink words; considering each text to be added a hyperlink as a text X, and processing the text X by following steps: carrying out the word segmentation processing to the text X, and obtaining a segmentation result; extracting the hyperlink words occurred in the hyperlink word list and the characteristic words occurred in the characteristic word list from the segmentation result; computing a weight of each of the hyperlink words that are occurred in the hyperlink word list, and computing a weight of each of the characteristic words that are occurred in the characteristic word list; determining a final weight of each of the hyperlink words according to each co-occurrence frequency and the weights of the hyperlink words; descendingly sorting the hyperlink words occurred in the hyperlink word list according to the final weights of the hyperlink words, and obtaining K numbers of hyperlink words that are arranged in first; and adding hyperlinks for the K numbers of hyperlink words, wherein K is a positive integer,