PROBLEM TO BE SOLVED: To provide an unoccupied house determining device for determining whether or not a corresponding house is an unoccupied house based on an address. In a communication system, a vacant house determination device 100 includes a storage unit that stores abolition information including an address and at least information on an abolition state of power supply to the address, and a reception unit that accepts input of address information. , The specific part that specifies the abolition state associated with the address information indicated by the address information using the abolition information, and whether or not the address indicated by the address information is a vacant house based on the specified abolition state. It is provided with an estimation unit for estimating the above and an output unit for outputting the estimation result by the estimation unit. [Selection diagram] Fig. 2
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