This paper proposes a person-centered approach for personal task management in which people can decide management of their tasks according to their environments including their subjective and multivalent judgement and human relationship. In our approach the task management is modeled as a decision-making process on their own resources. Human decision-making process consists of three types of activity, i.e., the intelligence activity, the design activity, and the choice activity. The proposal system assists each activity by three sub-systems, i.e., Visualizer, Optimizer, and Recommender respectively. At first, Visualizer indicates the attributes associated with each task such as the deadline, the subjective priority, and the workload, which are determined by the user. And Optimizer generates executable schedules from these tasks by active scheduler and multi-objective genetic algorithm. Finally, Recommender evaluates these alternatives by analytic hierarchy process. Also the system is...