This book presents the combined proceedings of the 7th International Conference onComputer Science and its Applications (CSA-15) and the International Conference onUbiquitous Information Technologies and Applications (CUTE 2015), both held in Cebu, Philippines, December 15 - 17, 2015. The aim of these two meetings was to promote discussion andinteraction among academics, researchers and professionals in the field ofcomputer science covering topics including mobile computing, security and trustmanagement, multimedia systems and devices, networks and communications,databases and data mining, and ubiquitous computing technologies such as ubiquitous communication and networking, ubiquitous software technology, ubiquitous systems and applications, security and privacy. These proceedings reflect the state-of-the-art in the development of computationalmethods, numerical simulations, error anduncertainty analysis and novel applications of new processing techniques inengineering, science, and other disciplines related to computer science.