In-home-presence probability calculation method, server apparatus, and in-home-presence probability calculation system

A device management method used in a server apparatus that manages, via a network, a plurality of devices provided in a structure,

• the server apparatus including one or more memories storing thereon (i) operation information related to a plurality of devices in the structure and (ii) time information related to a time at which a state has been entered in which it is expected that no one is present in the structure;
• the method comprising:
• for each of the plurality of devices, specifying operation times at which a certain operation has been performed, in accordance with the operation information;
• specifying in-structure-absence times at which a state has been entered in which it is expected that no one is present in the structure, in accordance with the time information;
• for each of the plurality of devices, calculating time differences for the specified operation times, each of the time differences being a difference between a corresponding one of the specified operation times and the in-structure-absence time that is first specified within a predetermined time period from the corresponding one of the specified operation times;
• and
• for each of the plurality of devices, specifying the performed certain operation as a behavior pattern of a person correlated to a behavior when the person continues being at the structure when a ratio of a frequency of the calculated time differences regarding the corresponding one of the plurality of devices, each of which is lower than a particular threshold value, is equal to or lower than an other threshold value.