8. The apparatus of claim 1 , further comprising: a feature vector extraction unit configured to extract at least one feature vector from each of the queries, a dimension graph generation unit configured to define a vector space in a predetermined number of dimensions based on a number of the at least one feature vector, wherein the cluster generator is configured to map the queries in the predetermined number of dimensions to generate the at least one cluster.
8. The apparatus of claim 1 , further comprising: a feature vector extraction unit configured to extract at least one feature vector from each of the queries, a dimension graph generation unit configured to define a vector space in a predetermined number of dimensions based on a number of the at least one feature vector, wherein the cluster generator is configured to map the queries in the predetermined number of dimensions to generate the at least one cluster. 9. The apparatus of claim 8 , wherein the dimensional graph generation unit is configured to define the vector space as a two-dimensional space in response to the feature vector extraction unit extracting two feature vectors.