Information retrieval apparatus and computer program

A computer-executable information retrieval apparatus for a web page retrieval using a retrieval keyword comprising:

• at least one processor;
• a computer storage medium embedded with computer instructions executed by the at least one processor, the executed computer instructions comprising:
• a word extract portion that extracts a first word from a web page on a display based on a display position of said web page on said display, wherein the displayed position is specified by a user, said word extract portion further extracts a second word placed around said extracted first word, said extracted second word is different from said extracted first word and is determined by an importance;
• wherein the importance of said extracted second word is calculated by a word importance calculation portion, the word importance calculation portion calculates the importance of said extracted second word based on an importance of said extracted second word itself and related to said extracted first word, wherein the word importance calculation portion further calculating said importance of said extracted second word related to said extracted first word based on a relationship between a ratio of the number of cooccurrences of said extracted second word with said extracted first word within a range of a certain character number in said web page to the total number of occurrences of said extracted second word in said web page, and a distance from said first word to said second word on said display;
• a retrieval portion that retrieves at least one web page using said extracted first word and second word.