10. The device of claim 7 , wherein: the word lattice includes a beginning lattice node, an ending lattice node, and one or more node paths located between the beginning lattice node and the ending lattice node; and the character-identification module includes: a token-movement unit configured to, for each node path of the one or more node paths, set a token on the node path between the beginning lattice node and the ending lattice node and move the token from the beginning lattice node to the ending lattice node along the node path; a score-calculation unit configured to calculate a token score of the token based on at least information associated with one or more node scores related to one or more lattice nodes on the node path and a probability related to a predetermined language model; and an optimum-selection unit configured to select a final token with a highest token score and select a combination of final candidate characters corresponding to one or more final lattice nodes on a final node path related to the final token as the optimal character sequence.
10. The device of claim 7 , wherein: the word lattice includes a beginning lattice node, an ending lattice node, and one or more node paths located between the beginning lattice node and the ending lattice node; and the character-identification module includes: a token-movement unit configured to, for each node path of the one or more node paths, set a token on the node path between the beginning lattice node and the ending lattice node and move the token from the beginning lattice node to the ending lattice node along the node path; a score-calculation unit configured to calculate a token score of the token based on at least information associated with one or more node scores related to one or more lattice nodes on the node path and a probability related to a predetermined language model; and an optimum-selection unit configured to select a final token with a highest token score and select a combination of final candidate characters corresponding to one or more final lattice nodes on a final node path related to the final token as the optimal character sequence. 12. The device of claim 10 , wherein the character-identification module further includes: a model-generation unit configured to generate a language model database including one or more original language models based on at least information associated with a dictionary database including one or more original dictionaries; a model-addition unit configured to, in response to a first dictionary being added to the dictionary database, generate a first language model based on at least information associated with the first dictionary and add the first language model to the language model database; a model-deletion unit configured to, in response to a second dictionary being deleted from the dictionary database, delete a second language model corresponding to the second dictionary from the language model database; and a model-modification unit configured to, in response to a third dictionary being modified, generate a third language model based on at least information associated with the third dictionary and add the third language model to the language model database; or modify a fourth language model corresponding to the third dictionary in the language model database.