Disclosed is a contents-providing system for receiving contents from a web server and providing the contents to a portable terminal connected via a network that comprises: a user information database for storing user ID information; an authentication server for performing authentication based upon the user ID information by using the user information database when the user ID information and a URL of a web server are input by the portable terminal, and outputting the URL after performing the authentication; and a data server for requesting that the web server corresponding to the URL provided by the authentication server provides the contents, processing the contents provided by the web server into a predetermined format, and transmitting the processed contents to the portable terminal.