A facility management device adapted to manage communication data that is transmitted and received between a plurality of facility equipments (110, 120a, 120b), comprising: a communicator adapted to receive the communication data; a temporary-memory controller adapted to store the communication data that was received by the communicator for a specified amount of time in a temporary memory; and an abnormality determiner adapted to determine whether or not there is an error as defined by a communication protocol in the communication data that is stored in the temporary memory, the facility management device characterized by comprising: a data copier adapted to store the communication data that is stored in the temporary memory in an abnormal-data memory when the abnormality determiner determined that there is an error as defined by a communication protocol in the communication data; and a transmission-waveform data acquirer adapted to acquire transmission-waveform data for the communication data and to store the transmission-waveform data that was acquired by the transmission-waveform data acquirer for a specified amount of time in the temporary memory; wherein the data copier is further adapted to store the communication data and the transmission-waveform data that are stored in the temporary memory in the abnormal-data memory, when the abnormality determiner determined that there is an error as defined by a communication protocol in the communication data. a communicator adapted to receive the communication data; a temporary-memory controller adapted to store the communication data that was received by the communicator for a specified amount of time in a temporary memory; and an abnormality determiner adapted to determine whether or not there is an error as defined by a communication protocol in the communication data that is stored in the temporary memory, the facility management device characterized by comprising: a data copier adapted to store the communication data that is stored in the temporary memory in an abnormal-data memory when the abnormality determiner determined that there is an error as defined by a communication protocol in the communication data; and a transmission-waveform data acquirer adapted to acquire transmission-waveform data for the communication data and to store the transmission-waveform data that was acquired by the transmission-waveform data acquirer for a specified amount of time in the temporary memory; wherein the data copier is further adapted to store the communication data and the transmission-waveform data that are stored in the temporary memory in the abnormal-data memory, when the abnormality determiner determined that there is an error as defined by a communication protocol in the communication data. a data copier adapted to store the communication data that is stored in the temporary memory in an abnormal-data memory when the abnormality determiner determined that there is an error as defined by a communication protocol in the communication data; and a transmission-waveform data acquirer adapted to acquire transmission-waveform data for the communication data and to store the transmission-waveform data that was acquired by the transmission-waveform data acquirer for a specified amount of time in the temporary memory; wherein the data copier is further adapted to store the communication data and the transmission-waveform data that are stored in the temporary memory in the abnormal-data memory, when the abnormality determiner determined that there is an error as defined by a communication protocol in the communication data.