Anglo-Dutch consumer products giant Unilever has said it is to increase its investment in the worldwide marketing and development of its ice cream by 20% over the next three years. Unilever, the world's largest ice cream maker with brands such as Magnum, Cornetto and Ben & Jerry's, plans to invest an additional €150m (US$164m) over the next three years in advertising and innovation in a bid to boost its annual sales growth of ice cream to 5%.