Processing method, device and system of instant message

A processing method of an instant message comprises the steps that a first terminal obtains the instant message input by a user through a first application program, a first processing request is generated according to the instant message, and the first processing request is sent to a server; the server processes the first processing request and sends the instant message to a second terminal according to a second identity mark; the second terminal displays the received instant message through a second application program, or the second terminal displays the received instant message through the first application program and the second application program. In addition, the invention further provides a processing device and system of the instant message. By means of the processing method, device and system of the instant message, the instant message can be transmitted among the different application programs, and therefore the processing efficiency of the instant message is improved.