A data visualization method and apparatus, where the method includes displaying a first density distribution diagram on a first map, where the first density distribution diagram represents density distribution, in a region, of source locations of flow events whose destinations are located in a target reference region, and displaying a second density distribution diagram on a second map, where the second density distribution diagram represents density distribution, in a region, of destinations of flow events whose source locations are located in the target reference region. Hence, bidirectional density distribution associated with each other using the target reference region are displayed on two maps in a linked manner, thereby implementing visualization of bidirectional density distribution data.