1. A method for determining a stability factor of an adaptive filter, comprising: determining, by a processor according to a first input signal that is input to the adaptive filter, a reference input matrix of the first input signal; determining, by the processor, a stability parameter of the first input signal according to the reference input matrix by: transposing the reference input matrix in order to obtain a transposed matrix; multiplying the transposed matrix by the reference input matrix in order to obtain a first matrix; and determining, as the stability parameter, either a value of a determinant of the first matrix or a result obtained by taking a logarithm of a value of a determinant of the first matrix; and determining, by the processor, the stability factor of the adaptive filter according to the stability parameter.