A data visualization method and a data visualization device. The data visualization method includes the following steps: capturing a clickstream that includes a plurality of click data; generating a similarity value for each of the plurality of click data by comparing a first sequential segment of each of the plurality of click data with a segment pattern; capturing the click data having the maximum similarity among the plurality of click data and capturing a second sequence segment of each of the click data having the maximum similarity; visualizing the second sequential segments in a 2D space to present the visualized sequence data of each of the second sequence segments, and setting a position of the click data, having the maximum similarity, in the visualized sequence data to be at a datum point in a first dimension of the 2D space.