2. The voice service system according to claim 1 , wherein the control unit counts the number of voice anchors used and stores a resultant counter in the database.
1. A voice service system comprising: a database storing a plurality of voice nodes and a plurality of voice anchors, wherein each of the plurality of voice nodes includes information to be provided to a user, each of the plurality of voice anchors are keywords of the information to be provided to the user, and each voice node includes at least one voice anchor associated with another voice node; a call connection unit to receive a voice instruction from a terminal and to transmit a voice message to the terminal in response to the voice instruction, wherein the voice message includes one or more of the plurality of voice anchors; a voice processing unit to convert the voice instruction received from the terminal into a data format and to convert an internally-created voice service document into the voice message; a grammar management unit to determine that the converted voice instruction includes data matching one of the plurality of voice anchors and an associated voice node, the grammar management unit further to extract a grammar from the associated voice node, wherein the grammar is registered as matching one of the plurality of voice anchors and expected to be spoken by a user in response to the associated voice node, wherein extracting a grammar from the associated voice node includes dividing text of the associated voice node according to word phrases, removing prefixes, suffixes, and special characters from the divided text of the associated voice node to create a word list, and extracting a word from the word list that matches with one of the plurality of voice anchors stored in the database; a document management unit for creating the voice service document from the associated voice node ; and a control unit for controlling information related to the registered voice anchor.