In this paper, we propose MetaWeaver which can selectively utilize effective ones from regis-tered search engines depending on queries. Traditional meta-search engines use all the registered search engines without considering which search engines are appropriate, and often return many irrelevant Web pages in the hit list. In contrast with that, MetaWeaver is able to evaluate the spe-cialties of each search engine by analyzing the hit list for sample queries, and to utilize them for selecting adequate search engines for current queries. Also we found out our approach is promising by making preliminary experiments.