In Database Center for Life Science (DBCLS), we have been tackling the problem how to organize various types of database in life science under the MEXT Integrated Database Project. Currently, we are developing database integration technologies to utilize huge amount of public data in collaboration with various sectors of biologists including National Bioscience Database Center (NBDC) newly founded in Japan Science and Technology Agency (JST). We will present current status of the project and how to use data produced and maintained in the system.