To provide a user who reuses a flow edited by using visual programming with useful flow change related information, a code management system manages codes before and after editing of a flow edited by the user using visual programming, with a code management tool capable of version management, obtains a logic change degree that is an index indicating a degree of change in a logic related difference of differences before and after the code change and a layout change degree that is an index indicating a degree of change in a layout related difference of the differences before and after the code change, and outputs information based on the logic change degree and the layout change degree.
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