Method and system for informing opposite side through network after inputting contact information

The invention discloses a method and a system for informing an opposite side through a network after inputting contact information. The method comprises the following steps: A. a user A acquires contact information of a user B; B. the user A inputs and stores the contact information of the user B into a preset website; and C. the preset website automatically transmits a message to the user B to inform the user B that the user A has already stored the contact information in the preset website. By utilizing the method and the system, when the user, who receives a name card, inputs the name card information into a specific website with the function of maintaining contact person information, the website informs the owner of the name card that the name card information has already been stored by the user, thereby establishing the connection between the two users and providing convenience for further contact after people exchange name cards.