1. A stream filtering method of a storage device, the method comprising: setting up a filter manager with data format information and a filtering condition provided from a host; searching and projecting data corresponding to the filtering condition from one or more memories in parallel by one or more stream filters according to a control of the filter manager to produce searched and projected data; merging the searched and projected data at the one or more stream filters into a merged result according to the control of the filter manager; and providing the merged result to the host.