The frequency analysis for the keywords used in national development plans is conducted to trace the changes of the plans and to clarify the relationship between the plans and their times. Although the management of a national plan, which means basically to apply PDCA cycle, has been well performed, the bureaucracy disturbed checking a previous plan to find out inadequate parts of the plan. Finally, populations and areas in DID are analyzed to conclude that urban policies should be identified to make diffused urban area more comfortable, effective and efficient.