Method and system for displaying another advertisement data in checking identical advertisement identification

A method for checking whether one advertisement ID is the same as another advertisement ID and displaying new advertisement data and a system thereof are provided to maximize advertisement effect rather than an advertisement scheme of displaying the same advertisement data concurrently by displaying one between the first and the second advertisement data which have the same advertisement ID or the third advertisement data which is new and different from the first and the second advertisement data. A method for checking whether one advertisement ID is the same as another advertisement ID and displaying new advertisement data includes the following several steps. A system records advertisement data, including advertisement IDs, at an advertisement database and maintains the advertisement database(201). The system loads the advertisement data from the database to a local memory of a user computer which accesses a web page(202). The system identifies the advertisement ID for the advertisement data loaded at the local memory(203). The system checks whether there exists advertisement data which has the same ID as collided advertisement data on the same web page(204). If so, the system identifies display advertisement data predetermined from the advertisement database(206). The system exposes the display advertisement data on the web page(207).