The Democratic People's Republic of Korea (DPRK) will "create atmosphere to ameliorate the relations between the DPRK and South Korea" by following previous inter-Korean joint declarations, said Kim in a televised New Year address.
Last month, the DPRK threatened to attack South Korea without any notice in response to anti-Pyongyang rallies on the second anniversary of the death of former leader Kim Jong Il.
He warned that a massive nuclear disaster would be brought if an all-out war broke out on the peninsula, in which the US would not be safe either.
KIm: Will strengthen military forces against any provocation
He also urged the whole party, military and people to unite in the "single-minded" spirit known as "following nobody, but only loyal to Kim Il Sung and Kim Jong Il," after the execution of Jang Song Thaek, once a powerful senior official in the party, for his "anti-party and counter-revolutionary" crimes.
In the 30-minute televised message, Kim set forth tasks for 2014.
He emphasised on agriculture, light industries, coal-mining, electricity, rail transport, and metallurgical industries, with a view to increasing output of quality consumer goods and promoting agricultural productivity.