Method and vehicular multimedia device allowing cellphone APP (application) startup by cellphone interconnection

The invention relates to the technical field of automotive electronics and discloses a method allowing cellphone APP (application) startup by cellphone interconnection. The method includes the steps: a vehicular multimedia device is in communication connection with a cellphone, a user command is input into the vehicular multimedia device, the vehicular multimedia device generates a control command according to the user command and outputs the control command to the cellphone connected, the cellphone receives and responds to the control command and directly starts a corresponding APP installed in the cellphone according to the control command, a cellphone interface image is projected and transmitted to the vehicular multimedia device, and the vehicular multimedia device displays a cellphone APP interface. By the use of the method and the vehicular multimedia device allowing the APPs installed in the cellphone to be started without providing special APPs in the cellphone, the process of starting the cellphone APPs during interconnection of the vehicular multimedia devices is simplified, and product experience is improved.