Abstract: A workflow system includes a sub-workflow define means for defining a sub-workflow which determines a work flow within a section and a sub-workflow interface part disposed at every section, the sub-workflow interface part having a definition of a correspondence of sub-workflow used according to said data. Data is transferred via the sub-workflow interface part disposed at the section units. When the sub-workflow interface part receives data, a sub-workflow corresponding to the received data is activated so that a route can be defined at every section, thereby making it easy to define a route. Therefore, when a change occurs in a section or a route is changed in somewhere of the section, the route may be defined again within that section, and the route can be changed easily. Also, data sequentially flows among the respective sections via the sub-workflow interface part so that a continuity of a work processing among the sections can be maintained.