An associated information improvement method by an information processing device, the method comprising:
- selecting, based on priority information in which associated information and numeric information relating to the associated information are associated with each other, associated information associated with the numeric information which satisfies a first predetermined condition, the associated information being information in which two states among a plurality of states related to a target system are associated with each other;
- preparing a path including an intermediate state from a certain state to a goal state based on the selected associated information and specifying a reward given to a state included in the path;
- and
- calculating the numeric information in a case where the specified reward and a difference between the numeric information and given numeric information relating to the numeric information satisfy a second predetermined condition.