8. A method of voice conversation based on a method of searching information using web, comprising: performing voice recognition on a user query provided in voice so as to convert the user query to a user query text; performing a linguistic analysis on the user query which is converted into the user query text; generating a basic word vector about at least one of the user query text and a result of the linguistic analysis, searching a vector space corresponding to the basic word vector in a vector space database using the basic word vector, determining a degree of similarity between the basic word vector and the searched vector space, generating an expanded word vector based on a web search result performed using at least one of the user query text and the result of the linguistic analysis, and searching a vector space corresponding to the expanded word vector in the vector space database using the expanded word vector, when the degree of similarity is equal to or less than a threshold value, and searching knowledge information based on the vector spaces searched correspondingly to the basic word vector or the expanded word vector; converting the knowledge information into a response corresponding to the user query; and performing voice synthesis on the response so as to convert the response to voice.
8. A method of voice conversation based on a method of searching information using web, comprising: performing voice recognition on a user query provided in voice so as to convert the user query to a user query text; performing a linguistic analysis on the user query which is converted into the user query text; generating a basic word vector about at least one of the user query text and a result of the linguistic analysis, searching a vector space corresponding to the basic word vector in a vector space database using the basic word vector, determining a degree of similarity between the basic word vector and the searched vector space, generating an expanded word vector based on a web search result performed using at least one of the user query text and the result of the linguistic analysis, and searching a vector space corresponding to the expanded word vector in the vector space database using the expanded word vector, when the degree of similarity is equal to or less than a threshold value, and searching knowledge information based on the vector spaces searched correspondingly to the basic word vector or the expanded word vector; converting the knowledge information into a response corresponding to the user query; and performing voice synthesis on the response so as to convert the response to voice. 14. The method of claim 8 , wherein the searching knowledge information further comprises calculating an expanded search score based on the expanded word vector and the searched vector space, and sorting according to the expanded search score.