Digital nomad? has become the catchphrase that describes a new lifestyle in which people have been freed from the constraints of time and location, thanks to the progress of mobile intelligent devices and high-speed communication networks. A book with this title was published in 1997 by the author and David Manners of the United Kingdom?based Electronics Weekly . The first version was written in English; Japanese and Chinese versions were published the following year. Figure 1 shows photographs of the books and the authors.