Abstract: The invention includes: a model management unit configured to manage a chain of supply-related task as a model; a role management unit configured to assign a role to an executor of each of the tasks to manage the roles; a task access authority setting unit configured to set a task-specific access authority for each of the roles to generate task access authority information; and an access control unit configured to, when access from the executor of each of the tasks is received, refer to the task access authority information based on the role assigned to the executor and perform access control. With such configurations, detailed access control can be performed for a chain of supply-related tasks.