Abstract: It is provided a data delivery system of hybrid type in which a multicast delivery and a unicast delivery are combined. The system has a multicast delivery server and a unicast delivery server which have the same content data. A terminals has functions of a reception control, a multicast reception, a unicast reception, a playback control and a data playback. The multicast delivery server delivers a content by multicast at a certain fixed interval. When a content delivery request is made by a user, the user terminal immediately starts reception of the multicast delivery which began latest and, receives data from a head of the content till the time point of the start of the reception as lack in the multicast delivery data, individually by unicast. The user first starts browsing with the unicast data and, thereafter switches the unicast data to the accumulated multicast data.