Patent ID: 7561518

Claim:
A system for sending and receiving data comprising an information providing apparatus for sending content data and a data receiving apparatus connected to each other via a network and in which the content data is packetized for sending and reception between the information providing apparatus and data receiving apparatus, the data receiving apparatus including: a missing-packet detecting means for detecting a missing packet; a content data storage means for storing content data; a storage control means for designating a storage area corresponding to the missing packet based on data packet information obtained from packet headers and stored addresses associated with the content data stored at the content data storage means; and a missing-packet resend requesting means for requesting to resend the missing packet by a connection-oriented mode transmission; wherein the data receiving apparatus first receives the content data by a connectionless-mode transmission and second receives the missing packet by the connection-oriented mode after completion of the transmission of the content data by the connectionless-mode; and wherein, when the reception of the content data by the connectionless-mode transmission is completed and the missing-packet detecting means detects a missing packet, the missing-packet resend requesting means requests the information providing apparatus to resend the missing packet by the connection-oriented mode transmission, the resent missing packet stored at the designated storage area such that the designated storage area corresponds to an allocated storage location within the content data storage means where the missing packet would have been stored if the missing packet was not missing.