Abstract: To securely create an electronic album of photos taken of various keys owned by a person regardless of types of the keys, the electronic key photo album (10) includes a dummy photo generator (11) that cuts out a key image from a photo of a key taken together with a background of the key and complements the photo with a dummy image to generate a dummy photo; a photo storage controller (12) that stores the dummy photo in a first storage (101) together with metadata of the photo of the key and stores the key image in a second storage (102) in association with the dummy photo together with a relative position of the key image in the photo of the key; a photo restorer (13) that reads out a dummy photo from the first storage, reads out, from the second storage, a key image associated with the dummy photo thus read out and a relative position of the key image thus read out, and pastes the key image thus read out to the relative position thus read out in the dummy photo thus read out to restore an original photo of a

Abstract: To securely create an electronic album of photos taken of various keys owned by a person regardless of types of the keys, the electronic key photo album (10) includes a dummy photo generator (11) that cuts out a key image from a photo of a key taken together with a background of the key and complements the photo with a dummy image to generate a dummy photo; a photo storage controller (12) that stores the dummy photo in a first storage (101) together with metadata of the photo of the key and stores the key image in a second storage (102) in association with the dummy photo together with a relative position of the key image in the photo of the key; a photo restorer (13) that reads out a dummy photo from the first storage, reads out, from the second storage, a key image associated with the dummy photo thus read out and a relative position of the key image thus read out, and pastes the key image thus read out to the relative position thus read out in the dummy photo thus read out to restore an original photo of a

Abstract: Disclosed is a method of operating an air conditioner having a plurality of indoor units connected to a common outdoor unit as heat source machine. When operation of a plurality of indoor units is dictated depending upon the temperature differences between the room temperatures and the set temperatures therefor, the indoor unit having the smallest temperature difference is determined among those indoor units which are to operate, and the amount of heat exchange is limited in the indoor unit having the smallest temperature difference to advantageously perform air conditioning in respective rooms in which the indoor units are provided.