The disclosure provides a metadata generating system and a metadata generating method. The metadata generating system includes a storage device and a processor. The storage device stores a data acquisition module and a data analysis module. The processor is coupled to the storage device. The processor executes the data acquisition module to perform data acquisition on the original data and obtain the first data. The processor executes the data analysis module to analyze the first data and generate the second data. The data analysis module performs sample comparison on the second data to generate metadata.