To notify tenants of consumed quantity halfway of a regulated cycle.

In this building managing device 7 in a building where a plurality of tenants 3 are resident, the consumed quantity of the respective meters 4a to 4c installed in the respective tenants is monitored and the consumed quantity of the respective meters for every unit cycle shorter than the regulated cycle is stored and held to a metrical value buffer 12. When transmission requests 29 of the consumed quantity transmitted from information terminals 9 installed in the respective tenants via a network 8 are accepted, an accumulated value of the consumed quantity and utility rate from a time point of start of the regulated cycle to a time point of acceptance of the transmission requests is calculated as passage 30 by using consumed quantity and rate tables stored in the metrical value buffer and transmitted to an information terminal 7 at a transmission requesting origin.