thanks for click my question.
In the past, when the oops Schematic function is present in the blender, we can found users of datablock very easily. (oops schematic was remove since 2.49b.)
But now, how can I do taht in outliner??
below is a picture of 31 unidentified users.
This image doesn't affect the project.
so i can press Shift + X or delete it from the Blend File view in the outliner.
but I'm curious what 31 users are using this image!!!
Thank you for reading.

What I want is not a way to erase the residual data. The number of users is also not. It is just what user is using this data. Is there something I am missing? http://imageshack.com/a/img923/9154/3Fttqp.png
– J. SungHoon Jul 12 '17 at 05:12I was able to use this script to find a background image at another custom layout.
15_2.png was that guy.
However, as you said, this script doesn't find any empty objects or hidden images inside the node.
– J. SungHoon Jul 12 '17 at 12:49Three years ago, there was a person who had trouble with the same problem. Https://blender.stackexchange.com/questions/10758/find-users-of-a-material-texture-image-which-is-not-displayed-in-the-outline
Even the material and texture doesn't have a separate editor, so I need to create a new 3D object for check the details in the properties window.
– J. SungHoon Jul 12 '17 at 12:51To make the outliner as good as the oops schematic, the outliner should also provide a list of users in addition to the number of users in the datablocks or blend file mode to make it easier for finding users.
– J. SungHoon Jul 12 '17 at 12:52