An inter-channel phase difference parameter extraction method, comprising: obtaining a parameter used to determine an information extraction manner for a current frame of a multi-channel signal; determining an inter-channel phase difference, IPD, parameter extraction manner for the current frame of multi-channel signal based on the parameter used to determine the information extraction manner for the current frame of the multi-channel signal, wherein the determined IPD parameter extraction manner for the current frame of multi-channel signal is one of at least two preset IPD parameter extraction manners; and extracting an IPD parameter of the current frame of multi-channel signal based on the determined IPD parameter extraction manner for the current frame of multi-channel signal; wherein the parameter used to determine the information extraction manner for the current frame of the multi-channel signal comprises at least one of a signal feature parameter of the current frame and a signal feature parameter of each of A frames previous to the current frame, wherein A is an integer not less than 1; the signal feature parameter of the current frame comprises at least one of a parameter that is of the current frame and that represents a left-right channel coherence, a subband IPD variance of the current frame, a signal class of the current frame, and an inter-channel time difference, ITD, of the current frame; the signal feature parameter of each of the A frames previous to the current frame comprises at least one of a parameter that is of each of the A frames previous to the current frame and that represents a left-right channel coherence, a subband IPD variance of each of the A frames previous to the current frame, an ITD of each of the A frames previous to the current frame, an IPD parameter extraction manner for each of the A frames previous to the current frame, and a signal class of each of the A frames previous to the current frame; and the signal class comprises speech frame or music frame; characterized in that the parameter used to determine the information extraction manner for the current frame of the multi-channel signal comprises the parameter that is of the current frame and that represents left-right channel coherence; and if a value of the parameter that is of the current frame and that represents left-right channel coherence is greater than a first threshold, the determining an IPD parameter extraction manner for the current frame of multi-channel signal based on the parameter used to determine the information extraction manner for the current frame of the multi-channel signal comprises: determining that the IPD parameter extraction manner for the current frame of multi-channel signal is a first extraction manner. obtaining a parameter used to determine an information extraction manner for a current frame of a multi-channel signal; determining an inter-channel phase difference, IPD, parameter extraction manner for the current frame of multi-channel signal based on the parameter used to determine the information extraction manner for the current frame of the multi-channel signal, wherein the determined IPD parameter extraction manner for the current frame of multi-channel signal is one of at least two preset IPD parameter extraction manners; and extracting an IPD parameter of the current frame of multi-channel signal based on the determined IPD parameter extraction manner for the current frame of multi-channel signal; wherein the parameter used to determine the information extraction manner for the current frame of the multi-channel signal comprises at least one of a signal feature parameter of the current frame and a signal feature parameter of each of A frames previous to the current frame, wherein A is an integer not less than 1; the signal feature parameter of the current frame comprises at least one of a parameter that is of the current frame and that represents a left-right channel coherence, a subband IPD variance of the current frame, a signal class of the current frame, and an inter-channel time difference, ITD, of the current frame; the signal feature parameter of each of the A frames previous to the current frame comprises at least one of a parameter that is of each of the A frames previous to the current frame and that represents a left-right channel coherence, a subband IPD variance of each of the A frames previous to the current frame, an ITD of each of the A frames previous to the current frame, an IPD parameter extraction manner for each of the A frames previous to the current frame, and a signal class of each of the A frames previous to the current frame; and the signal class comprises speech frame or music frame; characterized in that the parameter used to determine the information extraction manner for the current frame of the multi-channel signal comprises the parameter that is of the current frame and that represents left-right channel coherence; and if a value of the parameter that is of the current frame and that represents left-right channel coherence is greater than a first threshold, the determining an IPD parameter extraction manner for the current frame of multi-channel signal based on the parameter used to determine the information extraction manner for the current frame of the multi-channel signal comprises: determining that the IPD parameter extraction manner for the current frame of multi-channel signal is a first extraction manner.