Japan's biggest high-tech exhibition opened Tuesday with electric vehicles using next-generation information technology at the forefront.

The fair has brought together 624 companies and groups, including 161 from overseas, to showcase their products and technologies, though 22 Chinese firms canceled out amid heightened anti-Japan sentiment in China over the Senkaku dispute, organizers said.

Around 2,290 booths are being operated for the five-day CEATEC Japan exhibition at Makuhari Messe in Chiba Prefecture, the organizers said.