Method for activating application, handheld electronic apparatus and car system

A method, a handheld electronic apparatus, and a car system for activating an application are provided. The handheld electronic apparatus obtains identification information from a car apparatus when the handheld electronic apparatus is connected to the car apparatus. Herein, the car apparatus is coupled to a power connection unit of a vehicle. The handheld electronic apparatus activates an application corresponding to the identification information after obtaining the identification information.