advanced in the big data field. The Japanese government announced their national big data
strategies, “The Integrated ICT Strategy for 2020” and “Declaration to be the World’s Most Advanced IT Nation” [21], in 2012 and 2013, respectively. They plan to develop Japan’s new national IT strategy with open public data and big data as its core during 2013–2020, and finally promote Japan as a country with the world’s highest standards in the extensive use of big data in the information technology industry.