1. A frequency based keyword extraction method utilizing a statistical measure, comprising: for at least one word in a document, computing a function of a number of times said at least one word occurs in said document; for said at least one word, computing a number of times said at least one word occurs in a corpus of documents; and thereafter providing a comparison based on comparing a function of said number of times of said document occurrences with said number of times said at least one word occurs in said corpus of documents in order to thereby extract at least one keyword from said document.