This paper reviews the latest development of information technology and internet security in Japan 2019 from four aspects：the development of artificial intelligence technology，digital governance technology，the use of big data and internet security. In terms of the development of artificial intelligence，the “human centered AI social principle” has been put forward；in terms of digital governance technology，the government has launched The Medium and Long Term Plan of Digital Governance，the central and local governments actively promote the opening of data；in terms of the use of big data，the government actively promote the official flexible use of big data held by private enterprises；in terms of network security，the government take “proactive defense” measures against the risk of internet security threats.