To provide a page aggregate and a page retrieving device with which smooth retrieval is enabled along with a human thinking process without any sense of incongruity.

While having a first index provided at one selected out of the top, bottom and end at least and a second index expressing the low-order concept of the first index, the page aggregate is equipped with this second index inside a page while relating it with the contents of the page. Besides, a storage device stores the first index and the second index expressing the low-order concept of this first index and when displaying the page of the retrieved result while using a keyword corresponding to the first index or keyword corresponding to the second index, the second index is displayed on this page. Therefore, by finding out the second index expressing the low-order concept of the first index on the target page, it can be estimated which kind of contents that page has.