Handwritten document processing apparatus and method

A handwritten document processing method of a handwritten document processing apparatus, comprising:

• acquiring, at the handwritten document processing apparatus, stroke data;
• generating, at the handwritten document processing apparatus, stroke groups each including one or a plurality of strokes, which satisfy a predetermined criterion, based on the stroke data;
• and
• generating, at the handwritten document processing apparatus, additional information which indicates a relationship between a first stroke group of the stroke groups and a second stroke group of the stroke groups, and assigning the additional information to the first stroke group.

A non-transitory computer-readable medium storing a computer program which is executed by a computer to provide steps of:

• acquiring stroke data;
• generating stroke groups each including one or a plurality of strokes, which satisfy a predetermined criterion, based on the stroke data;
• and
• generating additional information which indicates a relationship between a first stroke group of the stroke groups and a second stroke group of the stroke groups, and assigning the additional information to the first stroke group.