PURPOSE: To provide a learning method for executing a method for inductively learning a rule from machine learning data and a method for analyzing an inference process and efficiently learning an effective rule by the same program.

CONSTITUTION: Data to be sorted are converted into a graph and inputted. A processing process by a computer is also converted into a graph and inputted. Patterns appearing in an inputted graph are extracted and a pattern having a high evaluation result is outputted. The pattern is converted into a sorting rule or high speed rule in accordance with the sort of the input graph and the converted result is outputted.