A transmission module that is adapted to transmit specific transmission information to be processed by an information processing device along a predetermined transmission path including the information processing device, the transmission module comprising: a receiving unit that is adapted to receive information from an upstream transmission module located on an upstream side of said transmission module in the predetermined transmission path; a priority level setting unit that is adapted to set a priority level in transmission to a downstream transmission module located on a downstream side of said transmission module in the predetermined transmission path, for a plurality of pieces of specific information included in the specific transmission information received by the receiving unit; a storage unit that is adapted to store the specific transmission information in a memory of said transmission module in a manner where the plurality of pieces of specific information are arranged, with a storage location of the specific information being associated with the priority level set by the priority level setting unit; a forming unit that is adapted to extract a portion of the plurality of pieces of specific information from the specific transmission information stored in the storage unit in accordance with the storage location, based on a result of transmission to the downstream transmission module and to form new specific transmission information to be transmitted to the downstream transmission module; and a transmitting unit that is adapted to transmit the new specific transmission information formed by the forming unit to the downstream transmission module, wherein, when the transmission to the downstream transmission module fails, the forming unit is further configured to determine the number of pieces of specific information included in the new specific transmission information according to the number of transmission failures in such a way that with increasing number of transmission failures, the number of pieces of specific information included decreases by selecting pieces in descending order of priority level. a receiving unit that is adapted to receive information from an upstream transmission module located on an upstream side of said transmission module in the predetermined transmission path; a priority level setting unit that is adapted to set a priority level in transmission to a downstream transmission module located on a downstream side of said transmission module in the predetermined transmission path, for a plurality of pieces of specific information included in the specific transmission information received by the receiving unit; a storage unit that is adapted to store the specific transmission information in a memory of said transmission module in a manner where the plurality of pieces of specific information are arranged, with a storage location of the specific information being associated with the priority level set by the priority level setting unit; a forming unit that is adapted to extract a portion of the plurality of pieces of specific information from the specific transmission information stored in the storage unit in accordance with the storage location, based on a result of transmission to the downstream transmission module and to form new specific transmission information to be transmitted to the downstream transmission module; and a transmitting unit that is adapted to transmit the new specific transmission information formed by the forming unit to the downstream transmission module, wherein, when the transmission to the downstream transmission module fails, the forming unit is further configured to determine the number of pieces of specific information included in the new specific transmission information according to the number of transmission failures in such a way that with increasing number of transmission failures, the number of pieces of specific information included decreases by selecting pieces in descending order of priority level.