1. A document retrieving apparatus comprising: a document retrieving unit constructed to retrieve, from a plurality of document data, one or more document data which include a page or an image element that matches an input retrieval condition; a retrieval result list display unit constructed to display, on a display unit, a list display of the one or more document data which include the page or the image element that matches the retrieval condition based on retrieval results of the document retrieving unit; and a thumbnail display unit constructed to display, in the list display by the retrieval result list display unit, both of first and second thumbnail images for each displayed document data, wherein the first thumbnail image is associated with the page or the image element in the document data which matches the retrieval condition, and the second thumbnail image is associated with a page or an image element which is automatically selected from other pages or other image elements in the document data based on a thumbnail configuration setting, wherein for each displayed document data, the thumbnail display unit does not display a thumbnail image associated with a page or an image element which is not automatically selected from other pages or other image elements in the document data based on the thumbnail configuration setting, wherein the thumbnail configuration setting is a setting for selecting a first page or image element or a last page or image element in each displayed document data, wherein for each displayed document data, the second thumbnail image to be displayed includes a thumbnail image associated with a first page or image element or a last page or image element in the displayed document data, and wherein at least one of the document retrieving unit, the retrieval result list display unit, and the thumbnail display unit comprises at least one of a processor and a computer-readable storage medium.
1. A document retrieving apparatus comprising: a document retrieving unit constructed to retrieve, from a plurality of document data, one or more document data which include a page or an image element that matches an input retrieval condition; a retrieval result list display unit constructed to display, on a display unit, a list display of the one or more document data which include the page or the image element that matches the retrieval condition based on retrieval results of the document retrieving unit; and a thumbnail display unit constructed to display, in the list display by the retrieval result list display unit, both of first and second thumbnail images for each displayed document data, wherein the first thumbnail image is associated with the page or the image element in the document data which matches the retrieval condition, and the second thumbnail image is associated with a page or an image element which is automatically selected from other pages or other image elements in the document data based on a thumbnail configuration setting, wherein for each displayed document data, the thumbnail display unit does not display a thumbnail image associated with a page or an image element which is not automatically selected from other pages or other image elements in the document data based on the thumbnail configuration setting, wherein the thumbnail configuration setting is a setting for selecting a first page or image element or a last page or image element in each displayed document data, wherein for each displayed document data, the second thumbnail image to be displayed includes a thumbnail image associated with a first page or image element or a last page or image element in the displayed document data, and wherein at least one of the document retrieving unit, the retrieval result list display unit, and the thumbnail display unit comprises at least one of a processor and a computer-readable storage medium. 7. The apparatus according to claim 1 , wherein the thumbnail display unit displays the first thumbnail image to have a size larger than the second thumbnail image.