In the method, a first device receives a mixed signal including a target signal from a target device among a plurality of second devices and an interfering signal from the plurality of second devices. The first device determines a distribution characteristic of an amplitude of the mixed signal within an amplitude variation range, the distribution characteristic being associated with the target device and an interfering device generating the interfering signal. The first device determines the interfering device from the plurality of second devices based on the distribution characteristic. An interfering device in a communication system may be detected in real-time and accurately.