1. A method for matching speech data used to determine the similarity between an input speech data and a sample speech data, the method comprising: segmenting the input speech data into a plurality of input speech frames; segmenting the sample speech data into a plurality of sample speech frames; building a matching matrix, wherein each element of the matching matrix corresponds to one of the input speech frames and one of the sample speech frames and indicates a distance value between the corresponding input speech frame and the corresponding sample speech frame; determining a minimum value of the distance values indicated in each row of elements of the matching matrix, thereby obtaining a plurality of minimum distance values of the respective rows of elements of the matching matrix, determining a second least value of the distance values indicated in each row of elements of the matching matrix, thereby obtaining a plurality of second least distance values of the respective rows of elements of the matching matrix; summing up the minimum distance values and the second least distance value of the distance values indicated in each row of elements of the matching matrix, thereby obtaining a row score, determined by: row ⁢ ⁢ score = ∑ j = 1 r ⁢ ⁢ min r ⊗ C ⁢ [ MM ⁡ ( i , j ) ] + ∑ j = 1 r ⁢ min r ⊗ C - i c ⁢ [ MM ⁡ ( i , j ) ] ; determining a minimum value of the distance values indicated in each column of elements of the matching matrix, thereby obtaining a plurality of another minimum distance values of the respective columns of elements of the matching matrix, determining a second least value of the distance values indicated in each column of elements of the matching matrix, thereby obtaining a plurality of second least distance values of the respective columns of elements of the matching matrix; summing up the another minimum distance values and the second least value of the indicated distance values in each column of elements of the matching matrix distance values, thereby obtaining a column score, wherein: column ⁢ ⁢ score = ∑ i = 1 e ⁢ ⁢ min j ∈ R ⁢ [ MM ⁡ ( i , j ) ] + ∑ i = 1 e ⁢ min j ∈ R - j k ⁢ [ MM ⁡ ( i , j ) ] ; calculating a matching score obtained by combining the distance row score and the column score; and determining whether the input speech data and the sample speech data are similar according to the matching score.