14. A system for screening incoming calls, comprising a processing unit receiving an incoming call from a caller, generating a prompt to the caller in response to the incoming call, receiving a response corresponding to the prompt from the caller, determining whether the response conforms to a specific answer, if so, driving the device to indicate the reception of the incoming call using a manner, and if the response does not conform to the specific answer, re-generating the prompt to the caller, re-receiving a response corresponding to the prompt from the caller, and determining whether the response conforms to the specific answer.
14. A system for screening incoming calls, comprising a processing unit receiving an incoming call from a caller, generating a prompt to the caller in response to the incoming call, receiving a response corresponding to the prompt from the caller, determining whether the response conforms to a specific answer, if so, driving the device to indicate the reception of the incoming call using a manner, and if the response does not conform to the specific answer, re-generating the prompt to the caller, re-receiving a response corresponding to the prompt from the caller, and determining whether the response conforms to the specific answer. 24. The system of claim 14 , wherein the processing unit further rejects the incoming call or prompts the caller to leave a message if the wrong frequency of the response reaches a predefined number.