14. A title extracting apparatus for recognizing and extracting a required partial region from a document image of a document that has been converted into image data, comprising: character region generating means for generating character regions, including black pixel connected regions composed of connected black pixels of the document image; character string region generating means for unifying one or more character regions generated by said character region generating means, and for generating character string regions including one or more character regions; title extracting means for extracting a particular character string region of the character string regions, according to attributes of a plurality of character string regions generated by said character string region generating means, as a title region; and segment extracting means for horizontally dividing an inside of the character string region into a plurality of partial regions, extracting a partial segment region with a large black pixel occupying ratio from each of the partial regions, unifying horizontally connected partial segment regions that have heights exceeding a predetermined threshold regardless of the heights, and extracting the unified horizontally connected partial segment regions, wherein the title region is extracted using the unified horizontally connected partial segment region.
14. A title extracting apparatus for recognizing and extracting a required partial region from a document image of a document that has been converted into image data, comprising: character region generating means for generating character regions, including black pixel connected regions composed of connected black pixels of the document image; character string region generating means for unifying one or more character regions generated by said character region generating means, and for generating character string regions including one or more character regions; title extracting means for extracting a particular character string region of the character string regions, according to attributes of a plurality of character string regions generated by said character string region generating means, as a title region; and segment extracting means for horizontally dividing an inside of the character string region into a plurality of partial regions, extracting a partial segment region with a large black pixel occupying ratio from each of the partial regions, unifying horizontally connected partial segment regions that have heights exceeding a predetermined threshold regardless of the heights, and extracting the unified horizontally connected partial segment regions, wherein the title region is extracted using the unified horizontally connected partial segment region. 16. The title extracting apparatus as set forth in claim 14, wherein said segment extracting means is adapted for extracting a segment region that has a length similar to a width of the character string region.