You will need to edit the xslt for the Data View to parse the field  -
the hyperlink  field type will always return both.

Is there a document that will show  me how to do this?

I created a Links list  and used it as a data  source for a DataViewer Web
Part. As it was a test, both were in the same site.

When I selected the URL field  (as opposed to URL w/menu, etc), it gave me
just the properties you mentioned. When I examine the XSL for the
DataViewer, it shows the following for the display:

<td width="75%" class="ms-vb">
<a href="{substring-before(@URL, ', ')}"><xsl:value-of
select="substring-after(@URL, ', ')" /></a>
</td>

Perhaps you could check your web  part and change the relevant code to the
above? (Make a copy of the original code somewhere first, obviously)