1. A method for displaying a statistical chart, comprising: determining whether a screen rotation event of switching from portrait-orientation display to landscape-orientation display is received, and obtaining additional to-be-shown data added during switch from a portrait-orientation-display drawing area to a landscape-orientation-display drawing area if yes, and drawing the landscape-orientation-display drawing area; and displaying a statistical chart in the drawn landscape-orientation-display drawing area, the additional to-be-shown data being shown in the statistical chart.