6. A form recognition apparatus for recognizing a character string existing in an arbitrary table structure in a form, comprising: an image acquisition unit capable of obtaining a digitized form image of the form; a character string recognition unit capable of recognizing a character string existing in the form image obtained by the image acquisition unit; a character string extraction unit capable of extracting a headline wording that is a predetermined character string from character strings recognized by the character string recognition unit; a position specification unit capable of specifying a position in the form image, in which a headline wording not recognized by the character string recognition unit, on the basis of a result extracted by the character string extraction unit; a phrase creation unit capable of creating a headline wording to existing a position specified by the position specification unit; and a correspondence relationship specification unit capable of specifying a correspondence relationship between the headline wording including a headline wording created by the phrase creation unit and a character string other than the headline wording recognized by the character string recognition unit.
6. A form recognition apparatus for recognizing a character string existing in an arbitrary table structure in a form, comprising: an image acquisition unit capable of obtaining a digitized form image of the form; a character string recognition unit capable of recognizing a character string existing in the form image obtained by the image acquisition unit; a character string extraction unit capable of extracting a headline wording that is a predetermined character string from character strings recognized by the character string recognition unit; a position specification unit capable of specifying a position in the form image, in which a headline wording not recognized by the character string recognition unit, on the basis of a result extracted by the character string extraction unit; a phrase creation unit capable of creating a headline wording to existing a position specified by the position specification unit; and a correspondence relationship specification unit capable of specifying a correspondence relationship between the headline wording including a headline wording created by the phrase creation unit and a character string other than the headline wording recognized by the character string recognition unit. 7. The form recognition apparatus according to claim 6 , further comprising: a table structure determination unit capable of for determining a table structure existing in the form image, on the basis of a headline wording extracted by the character string extraction unit and arrangement of the headline wordings in the form image, wherein the position specification unit specifies the position using a determination result of the table structure determination unit; and the phrase creation unit creates a headline wording to exist in the position from a determination result of the table structure determination unit.