5. The method of claim 4 , wherein weighting values are adjusted according to the expanded word vector generated from the provided user query or the linguistic analysis result and the vector space stored in the basic vector space database and the expanded vector space database in calculating the expanded search score.
5. The method of claim 4 , wherein weighting values are adjusted according to the expanded word vector generated from the provided user query or the linguistic analysis result and the vector space stored in the basic vector space database and the expanded vector space database in calculating the expanded search score. 7. The method of claim 5 , wherein the weighting values are configured to have a bigger value when the expanded word vector generated from the linguistic analysis result corresponds to a vector space stored in the basic vector space database than when the expanded word vector generated from the user query corresponds to a vector space stored in the basic vector space database, wherein the weighting values are configured to have a bigger value when the expanded word vector generated from the linguistic analysis result corresponds to a vector space stored in the expanded vector space database than when the expanded word vector generated from the user query corresponds to a vector space stored in the expanded vector space database.