1. A visualization device comprising: an evaluation index calculation unit which is implemented by a processor and which calculates a value of an evaluation index representing a feature degree for each of combinations of a first attribute group and a second attribute group in terms of data on the second attribute group including one or more attributes and conditioned with the first attribute group including one or more attributes among high-dimensional data to be visualized; a visualization processing unit which is implemented by the processor and which generates image information for presenting combinations of the first attribute group and the second attribute group, which are determined to have large evaluation index values based on a predetermined criterion; and an output device which depicts the high-dimensional data using the image information generated by the visualization processing unit.