10. A logical structure model creation assistance device for assisting in the creation of a logical structure model, which stores, from an image in which character strings associated respectively with a plurality of logical elements constituting a logical structure are described, the logical elements, character strings associated respectively with the logical elements, and the logical structure, the device comprising: a memory to store the logical structure model; a character string logical structure extraction unit to store a character string in an input image and the logical structure among the character strings in the input image based on a result of recognition of the input image; a logical element selection unit to select a logical element among the plurality of logical elements according to the degrees of similarity between the character strings in the input image extracted by the character string logical structure extraction unit and the character strings associated respectively with the plurality of logical elements stored in the logical structure model; a character string extraction unit to extract a character string associated with the selected logical element and a character string in the input image associated with the logical element based on the logical structure among the character strings in the input image extracted by the character string logical structure extraction unit; and a display unit to display the character string extracted by the character string extraction unit as a candidate update target for the character string associated with the logical element selected by the logical element selection unit.
10. A logical structure model creation assistance device for assisting in the creation of a logical structure model, which stores, from an image in which character strings associated respectively with a plurality of logical elements constituting a logical structure are described, the logical elements, character strings associated respectively with the logical elements, and the logical structure, the device comprising: a memory to store the logical structure model; a character string logical structure extraction unit to store a character string in an input image and the logical structure among the character strings in the input image based on a result of recognition of the input image; a logical element selection unit to select a logical element among the plurality of logical elements according to the degrees of similarity between the character strings in the input image extracted by the character string logical structure extraction unit and the character strings associated respectively with the plurality of logical elements stored in the logical structure model; a character string extraction unit to extract a character string associated with the selected logical element and a character string in the input image associated with the logical element based on the logical structure among the character strings in the input image extracted by the character string logical structure extraction unit; and a display unit to display the character string extracted by the character string extraction unit as a candidate update target for the character string associated with the logical element selected by the logical element selection unit. 13. The logical structure model creation assistance device according to claim 10 , wherein, the logical structure model includes the logical elements for each of several different types of images, character strings associated respectively with the logical elements, and the logical structure for each of the several different images.