A workflow system includes: a workflow storage that stores workflows built by connecting a plurality of tasks assigned to persons in charge, respectively; a task extracting unit that extracts at least one task from each of two or more of the workflows stored in the workflow storage; a site creation unit that creates a conference site of which an access authority is given to the persons in charge of the tasks extracted by the task extracting unit and in which electronic information is shared; and an access controller that controls access to the conference site created by the site creation unit in accordance with the authority.