Command parsing and rewrite system

(57) the equipment and the method a summary user can control computer application by voice commanding, Voice commanding is processed with speech recognition application, it is made a candidate word phrase, and the process of making at least one candidate word phrase into an analysis tree using context-free grammar (CFG) is included. Two or more predetermined rewriting rules by which the group division was carried out at two or more phrases are related with an analysis tree, in order to rewrite an analysis tree. Two or more rewriting rules contain the rewriting component for rewriting the pattern matching part for comparing at least one copy of an analysis tree, and its compared portion of an analysis tree, respectively. Series of commands is made by investigating the node of the corrected analysis tree. Series of commands is sent to interpreter application, or is directly sent to computer application.