An electronic apparatus and a detection method using the same are provided. The electronic apparatus includes a processor, a platform controller, and an auxiliary controller. The processor includes a first bus compatible with a first standard. The platform controller is coupled to the processor, and the processor is connected to peripheral devices of the electronic apparatus through the platform controller or the first bus according to the first standard. The auxiliary controller is coupled to the processor through the first bus, and the processor controls the auxiliary controller through a second bus and the platform controller. The auxiliary controller receives a detection signal to detect the processor, the platform controller, or at least one of the peripheral devices in the electronic apparatus through the first bus compatible with the first standard according to the detection signal.