According to one embodiment, a medical diagnostic apparatus causes first display circuitry to display the medical image, generates a first compressed image by compressing the medical image, and wirelessly transmits the first compressed image. If marker information including position information is generated and wirelessly transmitted from the terminal device, the medical diagnostic apparatus receives the marker information. The medical diagnostic apparatus causes the first display circuitry to display a composite image in which a marker is composited on the medical image, based on the marker information. The medical diagnostic apparatus stores in storage circuitry the medical image which constitutes the composite image in accordance with a storage request.
