A processing capability information request method, performed by a first terminal, comprising: broadcasting (S101) a first message, wherein the first message carries request information, and the request information is configured to request for processing capability information of a second terminal that has received the request information; wherein the processing capability information comprises at least one of: an identifier, configured to indicate that the second terminal has a capability to determine that the duration required to respond to preset information is a fixed value; or a value, configured to indicate the duration required to respond to the preset information for the second terminal; characterised in that the method further comprises receiving a second message sent by the second terminal, in which the second message includes the processing capability information of the second terminal; determining (S103), in response to the processing capability information comprising the identifier and the value, that the second terminal has the capability to determine that the duration required to respond to the preset information is the fixed value, wherein the fixed value is the value; and determining (S104), based on the value, a target time for receiving an acknowledgement message sent by the second terminal in response to the preset information sent by the first terminal; or determining (S105), in response to that the processing capability information comprises the value but not the identifier, that the second terminal does not have the capability to determine that the duration required to respond to the preset information is the fixed value; and determining (S106), based on the value, a time interval for receiving an acknowledgement message sent by the second terminal in response to the preset information sent by the first terminal. broadcasting (S101) a first message, wherein the first message carries request information, and the request information is configured to request for processing capability information of a second terminal that has received the request information; wherein the processing capability information comprises at least one of: an identifier, configured to indicate that the second terminal has a capability to determine that the duration required to respond to preset information is a fixed value; or a value, configured to indicate the duration required to respond to the preset information for the second terminal; characterised in that the method further comprises receiving a second message sent by the second terminal, in which the second message includes the processing capability information of the second terminal; determining (S103), in response to the processing capability information comprising the identifier and the value, that the second terminal has the capability to determine that the duration required to respond to the preset information is the fixed value, wherein the fixed value is the value; and determining (S104), based on the value, a target time for receiving an acknowledgement message sent by the second terminal in response to the preset information sent by the first terminal; or determining (S105), in response to that the processing capability information comprises the value but not the identifier, that the second terminal does not have the capability to determine that the duration required to respond to the preset information is the fixed value; and determining (S106), based on the value, a time interval for receiving an acknowledgement message sent by the second terminal in response to the preset information sent by the first terminal. <EOS>