1. A data visualization method, comprising: capturing a clickstream, which comprises a plurality of click data; comparing a segment pattern with a first sequence segment of each piece of the click data to generate a similarity for each piece of the click data; capturing more than one piece of click data having the maximum similarity among the plurality of click data, and capturing a second sequence segment of each piece of the click data having the maximum similarity; and visualizing the second sequence segments in a two-dimensional (2D) space, in which visualized sequence data corresponding to the second sequence segments is presented and a position of each piece of the click data having the maximum similarity in the visualized sequence data is set at a datum point in a first dimension of the 2D space; wherein the first dimension of the 2D space is related to an order of plurality of click data, and a second dimension of the 2D space is related to an event status of each piece of the click data.