1. A method of text classification, the method comprises: parsing a given text into one or more words; determining a word vector in a spherical space model for one of the one or more words, a number of dimensions of the spherical space being equal to a number of categories, each category corresponding to a spherical space category vector; for each category, determining a distance between a sum of word vectors of the one or more words and the respective category vector; and classifying the text into one or more categories with the shortest distance.