Since corpus is a pile of everyday language usage, using computing tools is essential in collecting, sifting, mining and using the meaningful data from the massive text data. In this paper, we introduce two tools for handling the large scale corpus; IMS Corpus Workbench (CWB) and Sketch Engine. The architecture of the tools is the inverted index model as a type of reference database, providing corpus handlers with speed and extendibility. The limit of CWB lies in the Western language character unicode system (ISO-8859), causing unsatisfactory handling of Korean in the full-fledged scale. We need to consider more suitable architectural design for searching, storing and user-friendly interface in case of large scale corpus in Korean.