Abstract: A method and apparatus for visualizing hierarchy data with angular chart are provided wherein the hierarchy data comprises a plurality of levels. The method comprises determining at least one of the plurality levels of the hierarchy data as base levels; visualizing data units in the base levels with the angular chart, wherein each slice of the angular chart corresponds to the data unit in the hierarchy data; and in response to user's operation on the slice of the angular chart, visualizing data units in at least next level of the data unit corresponding to the selected slice. The data units in each level of the hierarchy data can be visualized hierarchically and clearly, even if the hierarchy data has numerous levels and/or data units.