The program synthesizing device according to the embodiment of the present invention includes: a coupling unit configured to couple an information acquiring plug-in module, an information processing plug-in module, and a presentation plug-in module through their input interfaces and output interfaces based on a mashup scenario; a plug-in module driving unit configured to sequentially drive the coupled plug-in modules; an information acquiring unit configured to acquire information when the information acquiring plug-in module is driven; an information processing unit configured to perform a predetermined process on the information when the information processing plug-in module is driven; an object resolving unit configured to determine a value of object presented by a specified presentation scenario when the presentation plug-in module is driven; and a program output unit configured to output a program being a presentation scenario in which the object value is resolved.