Data retrieval method and system based on index database

The embodiment of the invention provides a data retrieval method and a data retrieval system based on an index database. The method is applied to the data retrieval system which pre-builds a basic index database corresponding to basic data serving as a retrieval object. The method comprises the step of when obtaining auxiliary data serving as the retrieval object, building an auxiliary index database corresponding to the auxiliary data. The method also comprises the steps of when obtaining a data retrieval request, determining at least one target index database which exists currently, wherein the at least one target index database comprises one type of index database, the basic index database, or two types of index databases, the basic index database and the auxiliary index database; and determining a retrieval result corresponding to the data retrieval request based on the at least one target index database which is determined to exist currently and the corresponding retrieval object. According to the data r