There're some news applications on Eikon such as News Monitor or Reuters Top News.
I checked some headlines, it seems that News Monitor includes news reported on Reuters top news.
Is this idea right?
If not, please tell me the differences.
Besides, can I retrieve images or charts like published on Reuters top news via Eikon Data APIs?
Yes, the News Monitor app in Eikon displays all news available through Eikon including all the stories that are displayed in Top News app. In the News Monitor app you can use the news search code TOPNP to view the top news categories as they're being updated. Then for instance to get the list of stories published on the front page of the Top News app click on the headline reading "*TOP NEWS*-Front Page".
To answer the second part of your question, multimedia content such as images or charts is not available through Eikon Data APIs.