1. A method for determining core geographical information in a document, the method comprising: identifying appearances of a plurality of geographical names in the document, determining one or more frequencies of each geographical name's appearances in the document, the determining including: in response to determining that a particular appearance of a geographical name is within a name of a news agency, not counting the particular appearance of the geographical name within the name of the news agency in determining the core geographical information; assigning one or more positional weights to each geographical name according to positions of the geographical name's appearances in the document; computing a score of each geographical name based on the one or more frequencies and the one or more positional weights of the respective geographical name; and determining the core geographical information in the document based on the scores of the plurality of geographical names.
1. A method for determining core geographical information in a document, the method comprising: identifying appearances of a plurality of geographical names in the document, determining one or more frequencies of each geographical name's appearances in the document, the determining including: in response to determining that a particular appearance of a geographical name is within a name of a news agency, not counting the particular appearance of the geographical name within the name of the news agency in determining the core geographical information; assigning one or more positional weights to each geographical name according to positions of the geographical name's appearances in the document; computing a score of each geographical name based on the one or more frequencies and the one or more positional weights of the respective geographical name; and determining the core geographical information in the document based on the scores of the plurality of geographical names. 7. The method as recited in claim 1 , wherein computing the score of each geographical name comprises: increasing the score by a preset value if the respective geographical name appears conjunctively or consecutively with another geographical name.