The Discussion on Web Information Retrieval

With the rapid development of Internet,the volume of the Information based on Web increases exponentially. How to retrieve the information in real need of people becomes a huge challenge. So the Web-based Information Retrieval technologies come out. This paper discusses text-based Retrieval and Image-based Retrieval,in the part of text-based retrieval,describes the work flow of text retrieval based on the index and also presents some traditional information retrieval models,and in the part of image-based retrieval,discusses the retrieval based on the content at three different-levels,and points out focus of their own research.