A user management method according to the present disclosure includes: storing appliance use information including: appliance identification information for identifying an appliance; user information for identifying a user of the appliance; and an operating state of the appliance when the appliance was used; analyzing the appliance use information stored in the storing to identify, from among a plurality of functions of the appliance, one or more first functions each having a use frequency less than or equal to a threshold value; and providing the user with a notice which prompts use of the one or more first functions identified in the analyzing.
Please help me write a proper abstract based on the patent claims. CLAIM: 1. A user management method comprising: storing appliance use information including: appliance identification information for identifying an appliance; user information for identifying a user of the appliance; and an operating state of the appliance when the appliance was used; analyzing the appliance use information stored in the storing to identify one or more first functions from among a plurality of functions of the appliance, the one or more first functions each having a use frequency less than or equal to a threshold value; providing the user with a notice which prompts use of the one or more first functions identified in the analyzing; and adding one or more points for ranking the user information, wherein in the adding, the one or more points are added to the user information of the user of the appliance based on a result of the analyzing. 2. The user management method according to claim 1, wherein in the analyzing, one or more second functions are identified from among the plurality of functions of the appliance based on the appliance use information, and a use frequency of each of the one or more second functions identified is calculated based on the appliance use information, the one or more second functions each achieving the operating state of the appliance indicated by the appliance use information, and the one or more first functions identified include (i) a function having a use frequency less than or equal to a threshold value among the one or more second functions of the appliance used by the user, and (ii) a function not used by the user among the plurality of functions excluding the one or more second functions. 3. The user management method according to claim 1, wherein the threshold value is zero, and the one or more first functions have never been used by the user among the plurality of functions of the appliance. 4. The user management method according to claim 1, wherein in the providing, a notice is provided to the user, the notice prompting use of a first function for performing maintenance of the appliance among the one or more first functions identified. 5. The user management method according to claim 1 wherein in the adding, a total number of the one or more points added to the user information of the user of the appliance increases with a decrease in a total number of the one or more first functions among the plurality of functions of the appliance. 6. The user management method according to claim 5, further comprising extending a warranty period of the appliance of the user indicated by the user information to which the total number of the one or more points greater than or equal to a predetermined point has been added. 7. The user management method according to claim 5, further comprising permitting the user indicated by the user information, to which the total number of the one or more points greater than or equal to a predetermined point has been added, to perform an act in a predetermined community. 8. The user management method according to claim 1, wherein the appliance comprises a plurality of appliances, and in the analyzing, the appliance use information stored in the storing is further analyzed and two or more appliances used during a same time period are identified from among the plurality of appliances to calculate a level of housework efficiency increased by the user of the plurality of appliances. 9. The user management method according to claim 1, further comprising communicating with each of a plurality of the appliances to receive the appliance use information of the appliance, wherein the appliance identification information is for identifying a type of the appliance, and in the analyzing, the appliance use information of the appliance is analyzed to identify a function from among a plurality of functions of each type of the plurality of appliances as the one or more first functions, the function having a use frequency less than or equal to a threshold value determined for each type of the plurality of appliances. 10. The user management method according to claim 9, wherein in the adding, among user information items of users each of whom is a user of two or more types of the appliances, one or more points are added to a user information item of a user of the two or more types of the appliances, a total number of the one or more points increasing with a decrease in a total number of the one or more first functions identified from among a plurality of functions of each of the two or more types of the appliances. 11. A server device comprising control circuitry and a storage device, the control circuitry operative to: store, in the storage device, appliance use information including: appliance identification information for identifying an appliance; user information for identifying a user of the appliance; and an operating state of the appliance when the appliance was used; analyze the appliance use information stored in the storage device to identify one or more first functions from among a plurality of functions of the appliance, the one or more first functions each having a use frequency less than or equal to a threshold value; provide the user with a notice which prompts use of the one or more first functions identified; and add one or more points for ranking the user information, wherein the control circuitry adds the one or more points to the user information of the user of the appliance based on a result obtained by analyzing the appliance use information. 12. A user management system comprising: a plurality of appliances; and a server device, wherein the server device includes control circuitry and a storage device, the control circuitry operative to: store, in the storage device, appliance use information including: appliance identification information for identifying each of the plurality of appliances; user information for identifying a user of the appliance; and an operating state of the appliance when the appliance was used; analyze the appliance use information stored in the storage device to identify one or more first functions from among a plurality of functions of the appliance, the one or more first functions each having a use frequency less than or equal to a threshold value; provide the user with a notice which prompts use of the one or more first functions identified; and add one or more points for ranking the user information, wherein the control circuitry adds the one or more points to the user information of the user of the appliance based on a result obtained by analyzing the appliance use information.