Identify tasks that are necessary for agreement formation and information transmission in collaborative work between stakeholders and that are missing from the recognition of each stakeholder. The task identifying device 1 a includes a task of concern generating a concerned task model structuring the relationship between the activity included in the stakeholder information indicating the action content of the stakeholder and the task concerning the task detailing the activity and the activity to which the activity belongs A model generating means and a task specific model structuring a relationship between a necessary concern at an arbitrary point in the development process and an activity to be accomplished corresponding to the required interest and a task detailing the activity And task extracting means for comparing the task of the concerned task model and the task of the task specific model and extracting the difference.
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