Patent ID: 7355973

Claim:
A data transmitting device comprising: a data transmitting and receiving part communicating with a second communication system and transmitting data destined for the second communication system in data frames to the second communication system, wherein the data transmitting and receiving part receives, from the second communication system, information indicative of a first data amount which is successively received by the second communication system; and the data transmitting device successively transmits, to the second communication system through the data transmitting and receiving part, data frames whose amount corresponds to the first data amount or a second data amount which can be successively transmitted by the data transmitting and receiving part, whichever is not greater, wherein the second data amount is a data amount corresponding to the storage capacity of a temporary memory for data transmission of the data transmitting and receiving part of the data transmitting device while the first data amount is a data amount corresponding to the storage capacity of a temporary memory for data reception of the second communication system.