Auditory Processing Disorder (APD) results from impaired processing of auditory information within the central nervous system and is frequently associated with language and learning difficulties. The aim of this study is to analyse the language, communication, and perceptual difficulties of a child with APD and to evaluate the role of comprehensive diagnosis and therapy based on the Warnke method. The study employed a case study design involving an eight-year-old boy diagnosed with APD. Data were collected through the analysis of diagnostic documentation, observation, interview, speech-language assessment, and evaluation of higher auditory functions using the Warnke diagnostic procedure. The findings revealed substantial deficits in speech comprehension, language competence, phonemic hearing, phonological skills, and basic auditory-visual-motor functions. Follow-up assessment conducted after six weeks of systematic auditory training with the Brain-Boy Universal device demonstrated improvement across all assessed auditory-visual-motor functions. The results confirm the importance of comprehensive multidisciplinary assessment in children with APD and indicate that therapy based on the Warnke method may effectively complement speech-language intervention by supporting the development of auditory processing and language-communication skills.