Method and system for realizing automatic binding of first terminal and second terminal

The invention discloses a method for realizing automatic binding of a first terminal and a second terminal which are preinstalled with a same application. The method comprises the steps that: the first terminal generates a first identifier containing information of the application, and sends the first identifier to the second terminal; the second terminal generates a second identifier containing information of the application, and generates a third identifier according to the second identifier and the first identifier; and the second terminal sends the third identifier to a cloud server for backup binding, so that the first terminal and the second terminal can interact with each other. The invention further discloses a system for realizing automatic binding of the first terminal and the second terminal. According to the method and the system, the first terminal can interact with the uniquely-corresponding second terminal through the applications based on a same network platform, thus users can send messages to the uniquely-corresponding second terminal anytime and anywhere through the first terminal, thereby enhancing the experience of second terminal users.