An input system comprises a sensor and a sensing plate, wherein patterns are arranged in a plurality of preset areas on the plate face of the sensing plate; the sensor can identify the shape of the patterns when being placed on the sensing plate; the input commands corresponding to the patterns can be obtained according to the maping relation of the patterns and the input commands; and the input commands are sent to a command processing system. Due to the adoption of the input system, the corresponding input commands can be generated as long as the sensor is placed on the position of the sensing plate where the patterns are pre-arranged, thereby allowing the input process to be more convenient and fast.