1. A system for detecting and correcting mismatched Chinese characters in a phrase, the system comprising: a database including a plurality of Chinese characters, correct pronunciations and radical compositions of the Chinese characters, and a plurality of correct Chinese phrases, each of the phrases including at least two characters, the pronunciation and the radical composition being attributed for each Chinese character in the database for facilitating spell checking; a mismatched character detection module, which takes a Chinese phrase as input and performs a look-up in the database to retrieve the associated pronunciation, radical composition and possible phrases for each character of the input phrase; a mismatched character correction module, which compares the pronunciations and radical compositions of each mismatched Chinese character identified by the mismatched character detection module to determine if the characters are misspelled or mismatched and corrects the mismatched characters; and an inter-module communication channel provided between the mismatched character detection module and the mismatched character correction module, the mismatched characters and the pronunciations and the radical compositions of the characters being sent from the mismatched character detection module to the mismatched character correction module through the inter-module communication channel.