The Naver Trend Annual Book 2009 lists the top 10,000 search keywords in 2009. It provides a bird's eye view of what users were interested in and what major issues were. Created with the idea that millions of keywords searched by more than 40 million users were the best assets, the data is also valuable information. The book lists the most popular keywords of the year. The list is segmented into days, again into three hour intervals to show hot keywords chronologically. Keywords are also categorized by themes and compared with those of 2008. Produced every year since 2007, it was first published and distributed in 2008.