One of the features of Excel is the ability to save the workbook, worksheet or chart in HTML format. This How To will give you an idea of what to keep in mind when you save an Excel document as a Web page:
When saving a workbook as HTML, Excel may break the file down into separate component files. If only a single worksheet in the workbook contains data, Excel saves the workbook as a single file (Book1.htm, for example). However, if multiple worksheets in the workbook contain data, Excel uses frames to display the worksheets in a browser. Excel saves the frameset file with the path and file name you specify in the Save As dialog box.
It saves the worksheets as separate HTML files in a folder with the same name as the frameset file, for example: