10. The method as recited in claim 9 , wherein the computing the score for the respective geographical name comprises: determining one or more frequencies of the respective geographical name's appearances in the document; assigning one or more positional weights to the respective geographical name according to positions of the respective geographical name's appearances in the document; and computing a score of the respective geographical name based on the one or more frequencies and the one or more positional weights of the respective geographical name.
9. A method for determining core geographical information in a document, the method comprising: computing, by a computing device, a score for a respective geographical name of a plurality of geographical names that appear in the document; and computing one or more aggregated scores for one or more geographical regions at a comparable or a common level, a respective geographical region being related to at least one of the plurality of geographical names which are at a same level as or a lower levels relative to the respective geographical region, an aggregated score of the respective geographical region including an aggregation of scores of the at least one of the plurality of geographical names whose represented regions are at the same level as or lower levels relative to the respective geographical region.