A method for collecting user data includes: collecting content of a user action event; modifying a user interest data model which stores user interest data according to the content of the user action event collected. In this way, the interest and concerns of the user are effectively tracked. Furthermore, the method and system provided by embodiments of the invention features little disturbance to user and accurate collection of user information, thus effectively shows the interest of user. Through method and system provided by embodiments of the invention, the user data can be collected effectively and the interest of the user is well represented.