A control system for a terminal device includes a retrieval circuitry, a computing circuitry, a power circuitry, and a control circuitry. The retrieval circuitry is arranged to receive a plurality of electrical signals transmitted from a sensor of the terminal device. The electrical signals correspond to a first operational status thereof. The computing is arranged to determine a first variable value based on the electrical signals and a reference value. The power circuitry is arranged to retrieve a remaining power level of the terminal device, and determine a second variable value based on the remaining power level. The control circuitry is arranged to drive the terminal device to switch from the first operational status to the second operational status when the first variable value is greater than the second variable value.