1. A non-transitory computer-readable recording medium that, when read and executed by a computer causes the same to perform a logical structure model creation assistance method 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 with the logical elements, and the logical structure, the method comprising: firstly extracting character strings in an input image and the logical structure among the character strings in the input image; selecting one among the plurality of logical elements according to degrees of similarity between the extracted character strings in the input image and the character strings associated respectively with the plurality of logical elements stored in the logical structure model; secondly extracting 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 extracted character strings in the input image; and displaying the extracted character string as an update candidate for the character string associated with the selected logical element.