The book presents a theoretical and methodological framework that addresses the limitations of traditional, small-sample TV viewership surveys in today's evolving media landscape. It proposes a comprehensive system that reflects the communication effects of audio-visual information in the multiscreen era. Drawing on Media System Dependency Theory, the book maps the relationships among the various factors shaping media product consumption. Furthermore, it integrates interpersonal and mass communication into a single analytical system that covers multiple levels, from micro to macro. It also proposes the hypothesis of fluid influence among individuals, interpersonal relationships, and society. The book introduces a novel vector autoregression (VAR) model to evaluate the effects of multiscreen audio-visual communication and provides a practical program implementation system that connects theoretical frameworks with actionable industry applications. This book will offer valuable insights for scholars of media research, audiovisual communication, and cultural studies.