In normal cases if you want to read news offline on your local computer you have to install a news server software like INN or CNews. Also you are in the need for an nntp or uucp connection to your newsfeed. In fact that such packages contain much more features than you need, you run better by installing Leafnode.
Leafnode is much simpler to use and very small but there are some disadvantages: Leafnode is slow and loses news in about any error situation. That's why you shouldn't use it for a big news server, nevertheless, it´s appropriate for private users who don´t want spend much time configuring INN.