The U.S. and European markets will need two years to reach the $400 million in mobile commerce revenue generated in Japan today, a U.S. Internet research firm said Monday.

"European and U.S. carriers must use the next 24 months to upgrade their infrastructure and adopt business models that have driven the success of the Japanese market," Jupiter Communications Inc. said in a survey.

Jupiter's survey shows that by the end of 2000, the number of wireless subscribers with Internet-enabled handsets, such as NTT DoCoMo's i-mode mobile phones, will reach 6 million both in the U.S. and Europe, against 30 million in Japan.

Jupiter estimates that revenue generated from mobile commerce in 2000 will amount to $10 million in the U.S. and $15 million in Europe, against almost $400 million in Japan.