Material data processing device and method

The invention provides a material data processing device and method which can easily acquire data and can perform high-precision estimation. A material data processing device (1) is provided with: a regression model creation processing unit (26) that performs machine learning using two or more pieces of data including organization data (64) among process data (61), composition data (62), characteristic data (63), and organization data (64), and creates a regression model (33) that displays the correlation of each piece of data; and an estimation processing unit (27) that uses the regression model (33) to estimate any one of process data (61), composition data (62), characteristic data (63), and organization data (64) that are used in machine learning, the organization data (64) including a difference feature quantity, and the difference feature quantity being used in the machine learning process data (61), the composition data (62), the characteristic data (63), and the organization data (64). The difference