Abstract: To provide a technology of distributing a content in real-time at a high efficiency by asynchronously distributing only an updated portion when updating the content. A communication method performed by a management device and a client terminal that are connected via a network, wherein the management device executes steps of establishing a connection with the client terminal that transmits at least part of a content via the network, detecting an update of the content, and transmitting the updated portion to the client terminal as triggered by the detected update of the content, and the client terminal executes steps of establishing a connection with the management device, waiting for the updated portion of the content, and updating partially the content on the basis of the updated portion received during the waiting step.