1. A method for enhancing readability of an image displayed on a terminal, comprising: acquiring image feature information of the image; identifying an image type of the image based on the image feature information; selecting a readability enhancing way corresponding to the image type; and enhancing the image by the readability enhancing way, wherein the image feature information comprises a pixel distribution corresponding relationship of at least one color channel, the pixel distribution corresponding relationship comprising a corresponding relationship between a color level and a number of pixels with the color level; wherein identifying the image type of the image based on the image feature information comprises: detecting whether a changing pattern of the numbers of pixels corresponding to adjacent color levels is an abrupt changing pattern; determining that the image type of the image is a nature image in the case that the changing pattern is not the abrupt changing pattern; and determining that the image type of the image is a user interface image in the case that the changing pattern is the abrupt changing pattern; and wherein the adjacent color levels are two color levels that have a difference less than a predetermined value.