10. A method for presenting recommended information, comprising: displaying text data on a display; extracting keyword candidates from the text data; storing, in a storing unit, semantic attributes of the keyword candidates, semantic attribute rules containing scoring criteria for the semantic attributes, descriptive phrases extracted from the text data and describing the keyword candidates, and descriptive phrase rules containing scoring criteria for descriptive phrases based on respective determinations of interest in the descriptive phrases; calculating scores of the keyword candidates based on the semantic attribute rules and the descriptive phrase rules; selecting a selected keyword of the keyword candidates having a highest score among the keyword candidates; searching an information database with the selected keyword and receiving a search result; and displaying the search result on the display as recommended information relating to the text information.
10. A method for presenting recommended information, comprising: displaying text data on a display; extracting keyword candidates from the text data; storing, in a storing unit, semantic attributes of the keyword candidates, semantic attribute rules containing scoring criteria for the semantic attributes, descriptive phrases extracted from the text data and describing the keyword candidates, and descriptive phrase rules containing scoring criteria for descriptive phrases based on respective determinations of interest in the descriptive phrases; calculating scores of the keyword candidates based on the semantic attribute rules and the descriptive phrase rules; selecting a selected keyword of the keyword candidates having a highest score among the keyword candidates; searching an information database with the selected keyword and receiving a search result; and displaying the search result on the display as recommended information relating to the text information. 17. The method according to claim 10 , wherein the displaying the search result on the display comprises displaying the search result on a webpage in blank spaces in a single block.