I am writing a research paper about the Internet in the developing
countries. Then, I need the definition of the developing country and
the developed country. I searched many home pages, but I couldn't
find. Therefore, I'm now asking the question. "What are the definitons
of developing country and developed country?"
Could you please tell me the definitions?

Hi! Thanks for the question.

I have found the following definitions that you require.

a. Developed country

Definition – “a country that has reached a stage of economic
development characterised by the growth of industrialisation. In
developed countries, the amount of money made by the population
(national income) is enough to pay for schools, hospitals and other
services. Population growth in developed countries is usually slower
than in developing countries.”

b. Developing country / third world country

Definition - “a country that has not reached the stage of economic
development characterised by the growth of industrialisation. In
developing countries, the amount of money made (national income) is
less than the amount of money needed to pay for schools, hospitals and
other services (domestic savings). Often these countries also have big
populations, which are growing very fast. This means that there is
very little money to build new factories and increase the national
income. Developing countries find it hard to break this cycle of
poverty.”

Recycle More UK website
http://www.recycle-more.co.uk/res/res_gloss.html 

The WTO (World Trade Organization) and the UN however has dropped the
“developing countries” tag in favor of the “least developed country”
or LDC term.

In this dictionary of International Economics from the University of
Michigan shows the definition of an LDC according to the UN.

Least Developed Country 

Definition – “A country designated by the UN as least developed based
on criteria of low per capita GDP, weak human resources (life
expectancy, calorie intake, etc.), and a low level of economic
diversification (share of manufacturing and other measures). As of
2002 there are 49 LDCs.”

The WTO meanwhile has no strict rules for determining if a country is
a “least developed country”.

“There are no WTO definitions of “developed” and “developing”
countries. Members announce for themselves whether they are
“developed” or “developing” countries. However, other members can
challenge the decision of a member to make use of provisions available
to developing countries.”

“Who are the developing countries in the WTO?”
http://www.wto.org/english/tratop_e/devel_e/d1who_e.htm 

Here is a list of countries currently recognized by the WTO as an LDC.

“Least-developed countries”
http://www.wto.org/english/thewto_e/whatis_e/tif_e/org7_e.htm 
 
The following publication shows a detailed classification of countries
made by the UN in terms of being “developed” and “least developed”.

Classification of Countries
http://www.undp.org.np/publications/hdr2001/19_cntryclassf.pdf 

Search terms used:            
"Developed country" term
"Developing country" definition
"Least developed countries" UN definition
       
I hope these links would help you in your research. Before rating this
answer, please ask for a clarification if you have a question or if
you would need further information.
           
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Regards,           
Easterangel-ga           
Google Answers Researcher

The answear is exactly I wanted, but I already checked two links out
of three before I asked. However, I was amazed for your answearing
speed. It took only one day.