Patent ID: 8160107

Claim:
A data reception method for continuously receiving, from a transmitting end, data in packet units, each packet unit containing transmission data, the packet units being received at a receiving end, the data receiving method comprising: receiving an uncompressed packet in which predetermined transmission data is stored as uncompressed data, the predetermined transmission data being transmitted from a sender as a target of a transmission of the sender; setting an initial value of reference data to be the received predetermined transmission data, when the uncompressed packet is received by said receiving of the uncompressed packet; subsequently and continuously receiving compressed packets in which at least a portion of transmission data is compressed and stored as compressed data; restoring transmission data from a compressed packet to be restored, the compressed packet to be restored being from the subsequently and continuously received compressed packets, and the transmission data being restored based on the set initial value of the reference data and based on compressed data included in the compressed packet to be restored; outputting (i) the predetermined transmission data stored in the received uncompressed packet, and (ii) the transmission data restored from the compressed packet to be restored; and updating the reference data to be the transmission data restored from the compressed packet to be restored, only when the compressed packet to be restored includes an update flag and the update flag indicates that the reference data is to be updated, such that the reference data is no longer the initial value set by said setting of the initial value when the compressed packet to be restored includes the update flag indicating that the reference data is to be updated.