1. A voice recognition system, comprising: a mobile terminal receiving a voice recognition target word from a user; and a voice recognition server dividing a search space for voice recognition into a general domain search space and a specific domain search space and storing the spaces, and performing voice recognition for the voice recognition target word in link with the general domain search space and the specific domain search space, wherein the specific domain search space is selected by the user, wherein when a predetermined specific domain search space is selected by a user, the voice recognition server performs the voice recognition for the voice recognition target word through linkage of the selected specific domain search space and the general domain search space when the selected specific domain search space is present.