1. A method for copying a text format pattern, the method comprising: receiving a selection of a sample object from a user, the sample object including multiple sample paragraphs of which at least two sample paragraphs have different format patterns; receiving a format copying instruction from the user, the format copying instruction indicating reformatting a target object with a format pattern of the sample object, wherein the target object contains N number of target paragraphs; determining a corresponding relationship between the sample paragraphs and the target paragraphs by: generating a sample combination by dividing the sample paragraphs into M number of sample groups according to their order and format pattern, each sample group includes adjacent sample paragraphs of the same format pattern; generating a plurality of different candidate combinations by assigning the N number of target paragraphs to the M number of sample groups, wherein each of the plurality of candidate combinations comprises a different combination of target paragraphs and sample groups, and each of the N number of target paragraphs is assigned to only one of the M number of sample groups for each of the plurality of candidate combinations; selecting two or more preferred candidate combinations from the plurality of candidate combinations based on a degree of similarity between the sample combination and each of the plurality of candidate combinations; selecting a single matching combination from the two or more preferred candidate combinations; and applying the format pattern of the sample paragraphs to the target paragraphs in accordance with the corresponding relationship.