A data processing apparatus and method for various processing according to a preference of user. A controller collects parameters, s, z, for adjusting a picture quality inputted by user's operation and stores history information on them in the history information storage section. A memory bank stores coefficient seed data for producing coefficient data Wi. The coefficient seed data is updated on the basis of the history information stored in the history information storage unit, for example, at a version upgrade of a television receiver. A calculation circuit obtains pixel data of objective pixel in HD signal based on the estimation equation using data xi of a prediction tap selectively extracted from SD signal and the coefficient data Wi.