A method and apparatus for handling data analysis. The apparatus includes an editing device which adds user-specified one of a plurality of operation units to a user-specified layer in a data analysis in response to a user operation, each of the operation units performing a predetermined processing on an associated data source, a connecting device which connects at least one user-specified operation unit in the data analysis to an analysis path in response to a user operation, and a user interface. The user interface receives the user operations and displays the data analysis by representing layers in the data analysis, operation units in the layers and connections on the analysis path in a visual manner.