An electronic terminal, characterized by comprising: a ringtone sound source module configured to play a ringtone; wherein the ringtone sound source module comprises a speaker being connected to sound hole channels through a cavity sound guide tube and a channel switch system including an electromagnetic valve; a control module configured to control the ringtone sound source module to send out a specified sound signal and control switching of ringtone channels; wherein the specified sound signal comprises a test sound signal and a prompt ringtone signal; a plurality of sound hole channels configured to transmit the sound signal to outside of the electronic terminal; a sound collection module configured to collect an exterior sound signal; a signal processing module configured to process the collected sound signal; and the ringtone channel switch system configured to control switching of the sound hole channels; wherein: the control module is configured to instruct the ringtone sound source module to play a test ringtone signal, and to instruct the ringtone channel switch system to switch all sound hole channels one by one to output the test ringtone signal, and the sound collection module is configured to collect the exterior sound signal while each channel is outputting the test ringtone signal and to feed back the exterior sound signal to the signal processing module, and the signal processing module is configured to process the intensity of the fed-back exterior sound signal to obtain a processing result, and the control module is configured to determine an output channel of the prompt ringtone signal according to the processing result, to instruct the ringtone channel switch system to switch to the determined output channel, and to instruct the ringtone sound source module to play the prompt ringtone signal. a ringtone sound source module configured to play a ringtone; wherein the ringtone sound source module comprises a speaker being connected to sound hole channels through a cavity sound guide tube and a channel switch system including an electromagnetic valve; a control module configured to control the ringtone sound source module to send out a specified sound signal and control switching of ringtone channels; wherein the specified sound signal comprises a test sound signal and a prompt ringtone signal; a plurality of sound hole channels configured to transmit the sound signal to outside of the electronic terminal; a sound collection module configured to collect an exterior sound signal; a signal processing module configured to process the collected sound signal; and the ringtone channel switch system configured to control switching of the sound hole channels; wherein: the control module is configured to instruct the ringtone sound source module to play a test ringtone signal, and to instruct the ringtone channel switch system to switch all sound hole channels one by one to output the test ringtone signal, and the sound collection module is configured to collect the exterior sound signal while each channel is outputting the test ringtone signal and to feed back the exterior sound signal to the signal processing module, and the signal processing module is configured to process the intensity of the fed-back exterior sound signal to obtain a processing result, and the control module is configured to determine an output channel of the prompt ringtone signal according to the processing result, to instruct the ringtone channel switch system to switch to the determined output channel, and to instruct the ringtone sound source module to play the prompt ringtone signal. the control module is configured to instruct the ringtone sound source module to play a test ringtone signal, and to instruct the ringtone channel switch system to switch all sound hole channels one by one to output the test ringtone signal, and the sound collection module is configured to collect the exterior sound signal while each channel is outputting the test ringtone signal and to feed back the exterior sound signal to the signal processing module, and the signal processing module is configured to process the intensity of the fed-back exterior sound signal to obtain a processing result, and the control module is configured to determine an output channel of the prompt ringtone signal according to the processing result, to instruct the ringtone channel switch system to switch to the determined output channel, and to instruct the ringtone sound source module to play the prompt ringtone signal.