1. An apparatus for visualizing data, comprising: a single-data collecting unit to collect plural single-data having different formats; a first multi-data generating unit to generate first multi-data using plural first single-data that is obtained from the collected plural single-data and has the same format; a second multi-data generating unit to generate second multi-data using at least one of the plural first single-data, plural second single-data having a format different from the format of the plural first single-data, and the generated plural first multi-data; and a data visualizer to visualize at least one of the collected plural single-data, the generated first multi-data, and the generated second multi-data.