1. A method for adding hyperlinks to hyperlink words in a 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; respectively determining an IDF (inverse document frequency) value for each characteristic word after generating a characteristic word list by implementing word segmentation processing for each of the texts, wherein the IDF value is calculated by following processes: obtaining a quotient by a quantity of the variety of texts collected divided by a quantity of texts appearing the characteristic word, and calculating a logarithm of the quotient; 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, which comprises: for each hyperlink word H, calculating the weight WH of the hyperlink word H: 
 WH=TFH*IDFH; wherein, TFH represents TF (term frequency) value of the hyperlink word H and TFH refers to the quantity of the hyperlink word H appearing in the text X, and IDFH represents IDF value of the hyperlink word H; for each characteristic word F, calculating the weight WH of the characteristic word F: 
 WF=TFF*IDFF; wherein, TFF represents TF value of the characteristic word F, and IDFF represents IDF value of the characteristic word F; 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 to the K numbers of hyperlink words, wherein K is a positive integer.