The present invention discloses a method and a device to communicate between a mobile terminal and at least two backend servers, and the method of the present invention includes the following steps: registering a user of the mobile terminal as a user of the first backend server; obtaining the coding information by the barcode image taken through decoding the mobile terminal; the first backend server parsing the coding information to determine whether the barcode image is generated according to a preset coding rule, if the barcode image is generated according to the preset coding rule, executing subsequent steps; if the barcode image is not generated according to the preset coding rule, stopping executing the method after the mobile terminal is connected to a webpage corresponding to the coding information; the mobile terminal extracting service information corresponding to the coding information according to the coding information; the second backend server providing a service to the mobile terminal. The method and device of the present invention include multiple backend servers which cooperate to provide services for users of mobile terminal.