1. A combinatorial computing method comprising the steps of: receiving a first setting relating to a format and a data source for reading multiple groups of input data and a second setting relating to a combinatorial mode for combining the multiple groups of input data; obtaining a data combination of the multiple groups of input data according to the first setting and the second setting; arranging, in response to obtaining the data combination of the multiple groups of input data according to the first setting and the second setting, a first group and a second group of the multiple groups of input data into a format of a single data set according to a certain rule, wherein the certain rule includes determining a first input data element from the first group and a second input data element from the second group; determining a first key value for the first input data element and a second key value for the second input data element; merging the first input data element to the second input data element into the format of the single data set, wherein the first input data element and the second input data element are separated by a special format tag having key value data; performing a desired calculating operation on the data combination; and converting, in response to performing the desired calculating operation on the data combination, the single data set to the data combination of the multiple groups of input data by assigning, based on the key value data of the special format tag, the first key value to the first input data element and the second value to the second input data element.