An appliance management system for managing information about a plurality of appliances (11, 12,...), comprising: an information collection system that includes a database for storing information about the appliances, a first reception processing unit (110, 210) configured to write information about the appliances that has been received to the database, and a second reception processing unit (120, 220) configured to write information about the appliances that has been received to the database; and an information transmission apparatus (11a, 21) that includes a transmission unit configured to transmit the information about the appliances to the first reception processing unit (110, 210) or to the second reception processing unit (120, 220) via a communication line, and a transmission information creation unit configured to create transmission information, which is the information about the appliances to be transmitted by the transmission unit, wherein the first reception processing unit (110, 210) includes a first buffer (118, 218) capable of temporarily saving information, the second reception processing unit (120, 220) includes a second buffer (121, 221) capable of temporarily saving information, characterized in that: the first buffer (118, 218) has a capacity larger than a capacity of the second buffer (121, 221); the transmission information creation unit is configured to create as the transmission information to be sent to the first reception processing unit (110, 210), first transmission information from first-type information about the appliances, and create as the transmission information to be sent to the second reception processing unit (120, 220), second transmission information from second-type information about the appliances; and the transmission unit is configured to send the first transmission information to the first reception processing unit (110, 210) and send the second transmission information to the second reception processing unit (120, 220). an information collection system that includes a database for storing information about the appliances, a first reception processing unit (110, 210) configured to write information about the appliances that has been received to the database, and a second reception processing unit (120, 220) configured to write information about the appliances that has been received to the database; and an information transmission apparatus (11a, 21) that includes a transmission unit configured to transmit the information about the appliances to the first reception processing unit (110, 210) or to the second reception processing unit (120, 220) via a communication line, and a transmission information creation unit configured to create transmission information, which is the information about the appliances to be transmitted by the transmission unit, wherein the first reception processing unit (110, 210) includes a first buffer (118, 218) capable of temporarily saving information, the second reception processing unit (120, 220) includes a second buffer (121, 221) capable of temporarily saving information, characterized in that: the first buffer (118, 218) has a capacity larger than a capacity of the second buffer (121, 221); the transmission information creation unit is configured to create as the transmission information to be sent to the first reception processing unit (110, 210), first transmission information from first-type information about the appliances, and create as the transmission information to be sent to the second reception processing unit (120, 220), second transmission information from second-type information about the appliances; and the transmission unit is configured to send the first transmission information to the first reception processing unit (110, 210) and send the second transmission information to the second reception processing unit (120, 220). the first buffer (118, 218) has a capacity larger than a capacity of the second buffer (121, 221); the transmission information creation unit is configured to create as the transmission information to be sent to the first reception processing unit (110, 210), first transmission information from first-type information about the appliances, and create as the transmission information to be sent to the second reception processing unit (120, 220), second transmission information from second-type information about the appliances; and create as the transmission information to be sent to the first reception processing unit (110, 210), first transmission information from first-type information about the appliances, and create as the transmission information to be sent to the second reception processing unit (120, 220), second transmission information from second-type information about the appliances; and the transmission unit is configured to send the first transmission information to the first reception processing unit (110, 210) and send the second transmission information to the second reception processing unit (120, 220).