To efficiently design a job by exactly and logically modelling the present job without depending on technical ability of an analyzer.

The support system is provided with an input means 11 to input a purpose, a means of a job unit and information flow in the job unit by every job unit in an enterprise, a system chart generating means 12 to generate a job system chart based on the purpose and the means by every job unit, a data flow chart generating means 13 to generate the data flow chart based on the information flow by every job unit and an output means 14 to output the job system chart and the data flow chart. When data is added and modified, the job system chart and/or the data flow chart are modified and outputted according to addition and modification.