"Responding to such changes have become a common challenge for countries across the world, including Japan," he said, adding that the topic will be among many issues to be discussed at this week's G7 meeting.
"We're watching the situation with a strong sense of alarm, as markets and economies are globally intertwined," he said, adding that Japan's banking system was stable as a whole.
Japan would aim to issue a G7 joint communique after the finance leaders' meeting, which may stress the need for authorities to remain vigilant to banking-sector woes, two government sources with direct knowledge of the matter said.
The Nikkei newspaper reported on Tuesday the G7 finance leaders will discuss setting up individual emergency plans in case they face digital bank runs.
U.S. Treasury Secretary Janet Yellen, who will travel to Japan, will tell her G7 counterparts that the U.S. banking system remains sound, a senior Treasury official said on Friday.