The 35th International Conference on Information Networking (ICOIN) will take place in Jeju island, Korea & virtual conference, which is organized by Korea Institute of Information Scientists and Engineers (KIISE). It has been 35 years since ICOIN originally started under the name of Joint Workshop on Computer Communication in 1986. In past fifty years, computer communication and networking technologies have changed every aspect of our lives and societies. While computer networks have contributed largely to the current IT advancement, it will play a key role in new IT paradigms such as IoT and cloud computing and will be applied to various areas of the upcoming society including industry, business, politics, culture, medicine and so on. ICOIN is the most comprehensive conference focused on the various aspects of advances in computer communication and networking technologies. The main purpose of ICOIN 2021 is to improve our research by achieving the highest capability and encourage open discussions on computer communication and networking technologies. Authors are invited to submit original unpublished manuscripts that demonstrate recent advances in computer communications, wireless/mobile networks, and converged networks in the theoretical and practical aspects.