According to an embodiment, an appliance management device includes a communication device configured to acquire symptom information of a first appliance from a user's terminal, a memory including a database for accumulatively storing log data of each of appliances matched with the user, and a processor, wherein the processor may acquire log data of the first appliance among the log data of each of the appliances of the user based on the acquired symptom information, identify at least one piece of information related to the symptom information among a plurality of pieces of information included in the acquired log data, generate diagnostic information on the symptom information based on a result of identification, and transmit the generated diagnostic information to the terminal.