A method of managing an electronic appliance (110, 210), the method comprising: receiving first power consumption information measured in the electronic appliance while an operation requested by a user of the electronic appliance is performed by the electronic appliance; determining whether there is a malfunction of the electronic appliance by comparing the first power consumption information with second power consumption information for the requested operation stored in a database (136, 260), the second power consumption information being historical power consumption information; if it is determined that there is no malfunction of the electronic appliance: updating the second power consumption information corresponding to the requested operation with the received first power consumption information so as to maintain power consumption information reflecting the recent performance of the electronic appliance; and determining a worn out state of the electronic appliance based on the updated second power consumption information and predetermined third power consumption information for the requested operation at a predetermined time, stored in the database, wherein the predetermined time is a point of time when power consumption is approximately the same as predetermined power consumption required to perform the requested operation; and notifying externals about a result of the determination of a malfunction or a worn out state. receiving first power consumption information measured in the electronic appliance while an operation requested by a user of the electronic appliance is performed by the electronic appliance; determining whether there is a malfunction of the electronic appliance by comparing the first power consumption information with second power consumption information for the requested operation stored in a database (136, 260), the second power consumption information being historical power consumption information; if it is determined that there is no malfunction of the electronic appliance: updating the second power consumption information corresponding to the requested operation with the received first power consumption information so as to maintain power consumption information reflecting the recent performance of the electronic appliance; and determining a worn out state of the electronic appliance based on the updated second power consumption information and predetermined third power consumption information for the requested operation at a predetermined time, stored in the database, wherein the predetermined time is a point of time when power consumption is approximately the same as predetermined power consumption required to perform the requested operation; and updating the second power consumption information corresponding to the requested operation with the received first power consumption information so as to maintain power consumption information reflecting the recent performance of the electronic appliance; and determining a worn out state of the electronic appliance based on the updated second power consumption information and predetermined third power consumption information for the requested operation at a predetermined time, stored in the database, wherein the predetermined time is a point of time when power consumption is approximately the same as predetermined power consumption required to perform the requested operation; and notifying externals about a result of the determination of a malfunction or a worn out state.