A method, performed by a touch screen, for determining a target operating frequency of a stylus, wherein the method comprises: receiving a search signal sent by the stylus, wherein the search signal has a frequency corresponding to a current operating frequency of the stylus, detecting the frequency of the search signal, and judging whether the frequency of the search signal and an operating frequency of the touch screen satisfy a predetermined first relationship; and if the frequency of the search signal and the operating frequency of the touch screen satisfy the predetermined first relationship, sending a response signal to the stylus, the stylus acquiring the operating frequency of the touch screen and the stylus adjusting the current operating frequency of the stylus to the operating frequency of the touch screen, wherein the response signal is acquired via modulation according to the operating frequency of the touch screen, wherein prior to the receiving a search signal sent by the stylus, the method further comprises: detecting noise strengths of the touch screen at each frequency, and setting a frequency with the noise strength lower than a predetermined strength threshold among the detected noise strengths as the operating frequency of the touch screen; wherein the method is characterized in that the setting a frequency with the noise strength lower than a predetermined strength threshold among the detected noise strengths as the operating frequency of the touch screen comprises: selecting a frequency to which the stylus can most quickly hop via a hopping function as the operating frequency of the touch screen if there is more than one frequency with the noise strength lower than the predetermined noise threshold. receiving a search signal sent by the stylus, wherein the search signal has a frequency corresponding to a current operating frequency of the stylus, detecting the frequency of the search signal, and judging whether the frequency of the search signal and an operating frequency of the touch screen satisfy a predetermined first relationship; and if the frequency of the search signal and the operating frequency of the touch screen satisfy the predetermined first relationship, sending a response signal to the stylus, the stylus acquiring the operating frequency of the touch screen and the stylus adjusting the current operating frequency of the stylus to the operating frequency of the touch screen, wherein the response signal is acquired via modulation according to the operating frequency of the touch screen, wherein prior to the receiving a search signal sent by the stylus, the method further comprises: detecting noise strengths of the touch screen at each frequency, and setting a frequency with the noise strength lower than a predetermined strength threshold among the detected noise strengths as the operating frequency of the touch screen; wherein the method is characterized in that the setting a frequency with the noise strength lower than a predetermined strength threshold among the detected noise strengths as the operating frequency of the touch screen comprises: selecting a frequency to which the stylus can most quickly hop via a hopping function as the operating frequency of the touch screen if there is more than one frequency with the noise strength lower than the predetermined noise threshold. detecting noise strengths of the touch screen at each frequency, and setting a frequency with the noise strength lower than a predetermined strength threshold among the detected noise strengths as the operating frequency of the touch screen; wherein the method is characterized in that the setting a frequency with the noise strength lower than a predetermined strength threshold among the detected noise strengths as the operating frequency of the touch screen comprises: selecting a frequency to which the stylus can most quickly hop via a hopping function as the operating frequency of the touch screen if there is more than one frequency with the noise strength lower than the predetermined noise threshold.