On-line advertising system and method

The present invention relates to an online advertising system and method capable of providing to the user via wired or wireless communication network with advertising associated with the given content and the content. Online advertising system to maintain the advertising data, the category associated with the content (contents) provided to the keyword and advertisement database, a user terminal over a communication network for holding a category corresponding to the advertisement data associated with the advertisement data in accordance with the present invention from to the content database, the advertisement advertising data searching unit, the retrieved advertisement data by using the keywords associated with the retrieved advertisement data for retrieving advertisement data corresponding to the category associated with the content from the database, the advertisement data according to predetermined criteria part advertisement data employed for the introduction and a display control unit for controlling so that the adoption of the advertisement data is displayed on the user terminal in association with the content.