11. The mobile terminal according to claim 8 , wherein the controller sets a search keyword when a search keyword having the selected first letter is not already set.
8. A mobile terminal comprising: a memory unit configured to store phone numbers and identification names corresponding to the phone numbers; a display unit configured to display a first letter of the stored identification names in a phone number retrieval mode; an input unit configured to select a displayed first letter; and a controller configured to extract a second letter next to the selected first letter from the identification names having the selected first letter and to extract at least one search keyword consisting of the selected first letter as the first letter of the search keyword and the extracted second letter as the second letter of the search keyword, and display the at least one extracted search keyword and the identification names corresponding to the at least one extracted search keyword.