9. The text searching device according to claim 8 , wherein the extraction is performed according to at least one of the following predetermined extracting rules: extracting the initials of all words in the text to be searched; performing no extraction for little words in the text to be searched, wherein the little words do not express main meaning of the text to be searched; extracting the initials of only words having uppercase initials in the text to be searched; and extracting consecutive uppercase letters from the words having consecutive uppercase letters.
8. A text searching device, comprising: an extracting unit configured to extract initials of words in a text to be searched, wherein extraction is performed according to a predetermined extracting rule to form an initial character string; a creating unit configured to create mapping relation between the initial character string and the text to be searched; a matching unit configured to identify an abbreviation character string, wherein the abbreviation character string represents an abbreviation of some of the words in the text to be searched, and to perform matching between the initial character string and an abbreviation character string, wherein the abbreviation character string represents an abbreviation of some of the words in the text to be searched; and a locating unit configured to determine, based on the matching, an expanded phrase corresponding to the abbreviation character string, wherein the expanded phrase includes some of the words in the text to be searched, and determine, based on the mapping relation, a location of the expanded phrase in the text to be searched.