1. A method of selecting highlighting colors for topic elements in a chart, the method comprising: acquiring contrast elements and topic elements which need to be highlighted; acquiring colors of said contrast elements and layout information of the topic elements and the contrast elements in the chart; determining a plurality of combinatorial contrast policies for the colors of said contrast elements according to a color contrast standard; calculating weights of said combinatorial contrast policies using said layout information; and determining the highlighting colors for the topic elements according to said combinatorial contrast policies and their weights.