The Astronomy Data Center (ADC) is a “hub” of astronomical data, as one of the largest data centers in the world and will launch a new era, where Data-Intensive Astronomy is the fourth paradigm in astronomy. ADC delivers observational data from the NAOJ’s Subaru Telescope, ALMA, Nobeyama Radio Telescopes, VERA, ASTE, HINODE, and RISE. Data from other observatories in the world are also delivered through the “Japanese Virtual Observatory (JVO)” operated by ADC. Since observational research is often conducted by data analyses, ADC also supports various data reduction software, covering a wide range of wavelengths. ADC operates an extremely high-speed and secure computer network with a maximum speed of 40 Gbps. In addition to supporting astronomical research activities, ADC research staff have their own research goals such as reducing the large amounts of data produced at astronomical observatories accurately and effectively, and enhancing network security under distributed and complicated network configurations.