Formula graph automatic generation method and device

The invention provides a formula graph automatic generation method and device and relates to the field of data processing. In the document editing environment, when a user inputs mathematical formulas, corresponding graphs can be automatically detected and generated, the formulas and the graphs are united and stored, during usage, the formulas and the graphs are edited in the same environment, the graphs real-timely change with the change of the formulas, when the graphs are changed, the graphs are reversely analyzed to change the mathematical formulas, and when the formulas include subitem formulas, the subitem formulas can be extracted to serve as reusable items. All formulas can be defined as subitems that can be quoted by other formulas. Meanwhile, corresponding graphs of the reusable items can be synchronously reused for new graphs, and the usage is extremely convenient.