An auto-execution signal processing method and an apparatus performing the method are provided. That method is particularly applied to the apparatus supporting recognition of a human interface device standard. The apparatus preferably has an activation element such as a button, and it is to execute an automatic execution process by a key-activation manually or automatically as in connection with a computer system. Therefore, a predetermined purpose is met. According to a preferred embodiment, the apparatus having the auto-execution function is firstly initialized. Next, the activation element thereon is used to launch the automatic execution process. The process includes a step of driving a Finite State Machine to transfer an executable string of code to a computer system via a connection interface. After that, the executable string is compiled by an operating system in order to launch an application, such as entering a proprietary webpage.