1. A target advertising system to a plurality of web browsers, the system comprising: a user profile database, coupled to a user behavior server, configured to store browser-login mapping information and login cookie information, the browser-login mapping information being generated by mapping browser cookie information with the login cookie information, the browser cookie information being assigned to each of the plurality of web browsers; and an advertisement server configured to uniquely identify each browser using the browser cookie information assigned to the respective web browsers in response to receipt of each of the web browsers accessing the advertisement server, and to identify the login cookie information of a logged-in user upon receiving an information request from the logged-in user, wherein in response to receipt of browser cookie information of a web server upon the web browser accessing the advertisement server when a user does not log in the advertisement server, the user behavior server is configured to map the browser cookie information and the login cookie information with user profile information of the user, and wherein the advertisement server is configured to identify user profile information of the web browser among the plurality of web browsers based on the browser-login mapping information and to select targeted advertisement data and to display the targeted advertisement data associated with the identified user profile information corresponding to browser-login mapping information on a web page.