A workflow executing device includes a workflow executing unit; a first extracting unit that extracts a first preview property including a first element constituting a first data item and first position information; a second extracting unit that extracts a second preview property including a second element constituting a second data item and a second position information item, the second data item being obtained as a result of processing the first data item; a preview property managing unit that saves preview properties; a preview property generating unit that inserts the second element that is the processing result into the first preview property in place of the first element that is the processing target, and generates a new second preview property by associating the first position information with the second element; and a preview creating unit that creates preview images based on preview properties.