1. A text searching method, comprising the steps of: extracting initials of corresponding words in a text to be searched according to a predetermined extracting rule to form an initial character string; creating mapping relation between the extracted initial character string and the text to be searched; performing matching between the initial character string and an abbreviation character string to be searched for; and determining an expanded phrase corresponding to the abbreviation character string to be searched for and a location of the expanded phrase in the text to be searched according to a result of the matching and the mapping relation.