A visitor takes photos with his cell phone in the hall of the upcoming CeBIT tech fair in Hanover, Germany, March 8, 2014. CeBIT, the world's leading exhibition in the communication and information technology industry, will open to public on Monday in Hanover, Germany. The five-day event attracts about 3,500 exhibitors from 70 different countries and regions. (Xinhua/Zhang Fan)

Visitors gather at the Deutsche Telekom's stand of the CeBIT tech fair in Hanover, Germany, March 8, 2014. CeBIT, the world's leading exhibition in the communication and information technology industry, will open to public on Monday in Hanover, Germany. The five-day event attracts about 3,500 exhibitors from 70 different countries and regions. (Xinhua/Zhang Fan)

A visitor views a farm equipment at the CeBIT tech fair in Hanover, Germany, March 8, 2014. CeBIT, the world's leading exhibition in the communication and information technology industry, will open to public on Monday in Hanover, Germany. The five-day event attracts about 3,500 exhibitors from 70 different countries and regions. (Xinhua/Zhang Fan)

Staff members work at the IBM stand of the CeBIT tech fair in Hanover, Germany, March 8, 2014. CeBIT, the world's leading exhibition in the communication and information technology industry, will open to public on Monday in Hanover, Germany. The five-day event attracts about 3,500 exhibitors from 70 different countries and regions. (Xinhua/Zhang Fan)

A cameraman works at the Deutsche Telekom's stand of the CeBIT tech fair in Hanover, Germany, March 8, 2014. CeBIT, the world's leading exhibition in the communication and information technology industry, will open to public on Monday in Hanover, Germany. The five-day event attracts about 3,500 exhibitors from 70 different countries and regions. (Xinhua/Zhang Fan)

A visitor rests at the IBM stand of the CeBIT tech fair in Hanover, Germany, March 8, 2014. CeBIT, the world's leading exhibition in the communication and information technology industry, will open to public on Monday in Hanover, Germany. The five-day event attracts about 3,500 exhibitors from 70 different countries and regions. (Xinhua/Zhang Fan)