The present invention relates to a device for displaying a set of data in a space in a manner appropriate for the data while the data are being classified and arranged encounters a problem of requiring a large amount of computation and difficulty in observing results. In relation to a set of data to be expressed in the form of a matrix, a smaller volume of data pertaining to rows or columns are arranged in a space by means of a self-organizing method. The remaining data are arranged through use of only a result of arrangement. Classification and arrangement of data can be performed with a smaller amount of computation. Data pertaining to rows or columns can be utilized by displaying data pertaining to both rows and columns. Hence, a more understandable result can be obtained.