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. 8. The method as recited in claim 1 , wherein the determining that the particular appearance of the geographical name is within the name of the news agency comprises determining that the name of the news agency appears in immediate proximity to the particular appearance of the geographical name in the document.