Moving-picture image data-distribution method

A moving-picture image data-distribution method of transmitting/receiving moving-picture image data constituted by a plurality of image frames among a plurality of information terminals interconnected via a network, wherein

• in a distribution operation of the moving-picture image data from a transmission-side information terminal to a reception-side information terminal as a mode of bidirectional data communication among the plurality of information terminals,
• when the reception-side information terminal repetitively issues a transmission requirement for moving-picture image data at a predetermined time interval to the transmission-side information terminal being a transmission source, the reception-side information terminal calculates, in advance, at least one data amount of a receivable amount of image frames attributable to a band limitation of the network at the moment where the transmission requirement is issued and an own permissible load amount of image frame display processing, and sequentially notifies the transmission-side information terminal of an upper limit of at least any one of the data amount and a data structural element that is used as a basis for calculation of the data amount, as reception-limit information.