A method for secure communication, comprising: sending by a first terminal a request message to a second terminal, and initiating a first time counting according to a preset timing mode when finishing sending the request message, the request message at least containing data to be processed; receiving by the second terminal the request message, and obtaining by the second terminal a response message according to the request message; sending by the first terminal a response notification message to the second terminal when a value of the first time counting reaches a first value, and initiating a second time counting according to the preset timing mode when finishing sending the response notification message; receiving by the second terminal the response notification message, and sending by the second terminal the response message to the first terminal; permitting by the first terminal starting to receive the response message when a value of the second time counting is within an effective threshold of a second value, wherein the second value indicates a time needed by the second terminal from finishing receiving the response notification message to sending the response message; characterized in that, sending by the first terminal the request message to the second terminal comprises: sending by the first terminal the request message to the second terminal using a first frequency band; receiving by the second terminal the request message comprises: receiving by the second terminal the request message using the first frequency band; sending by the first terminal the response notification message to the second terminal when the value of the first time counting reaches the first value comprises: sending by the first terminal the response notification message to the second terminal using a second frequency band when the value of the first time counting reaches the first value; receiving by the second terminal the response notification message comprises: receiving by the second terminal the response notification message using the second frequency band; sending by the second terminal the response message to the first terminal comprises: sending by the second terminal the response message to the first terminal using the first frequency band; permitting by the first terminal starting to receive the response message when the value of the second time counting is within the effective threshold of the second value comprises: permitting by the first terminal starting to receive the response message using the first frequency band when the value of the second time counting is within the effective threshold of the second value. sending by a first terminal a request message to a second terminal, and initiating a first time counting according to a preset timing mode when finishing sending the request message, the request message at least containing data to be processed; receiving by the second terminal the request message, and obtaining by the second terminal a response message according to the request message; sending by the first terminal a response notification message to the second terminal when a value of the first time counting reaches a first value, and initiating a second time counting according to the preset timing mode when finishing sending the response notification message; receiving by the second terminal the response notification message, and sending by the second terminal the response message to the first terminal; permitting by the first terminal starting to receive the response message when a value of the second time counting is within an effective threshold of a second value, wherein the second value indicates a time needed by the second terminal from finishing receiving the response notification message to sending the response message; characterized in that, sending by the first terminal the request message to the second terminal comprises: sending by the first terminal the request message to the second terminal using a first frequency band; receiving by the second terminal the request message comprises: receiving by the second terminal the request message using the first frequency band; sending by the first terminal the response notification message to the second terminal when the value of the first time counting reaches the first value comprises: sending by the first terminal the response notification message to the second terminal using a second frequency band when the value of the first time counting reaches the first value; receiving by the second terminal the response notification message comprises: receiving by the second terminal the response notification message using the second frequency band; sending by the second terminal the response message to the first terminal comprises: sending by the second terminal the response message to the first terminal using the first frequency band; permitting by the first terminal starting to receive the response message when the value of the second time counting is within the effective threshold of the second value comprises: permitting by the first terminal starting to receive the response message using the first frequency band when the value of the second time counting is within the effective threshold of the second value.