The present disclosure relates to a data search system capable of providing increased speed in searching large-volume time series data in a DBMS. A data search system according to an embodiment of the invention may be implemented by a computing terminal as a system for searching data. The system may include: a query optimizer that checks whether or not a parallel scan is possible for a search target data table and generates a query execution plan; a parallel scan manager module that conducts a parallel scan on the table; and a query executer that executes the query execution plan generated by the query optimizer and, if a parallel scan is possible for the table, calls the parallel scan manager module, where the parallel scan manager module determines whether or not to execute a parallel scan by comparing the number of records forming the table with a preset value.