A machine learning apparatus , comprising: an acquisition unit configured to acquire first information as information for obtaining one or more state variables, characterized in that : the first information is related to something between a radio device (M1) and another radio device (M2); and the machine learning apparatus further comprises a learning unit configured to learn the one or more state variables and a radio wave propagation state in association with each other, the radio wave propagation state being at least one of amount of radio wave attenuation between the radio device and the other radio device, minimum transmission radio wave strength of the radio device that can be received by the other radio device, received radio wave strength of the other radio device relative to the transmission from the radio device at a predetermined transmission radio wave strength, and ratio of received radio signal strength in the other radio device to the transmitted radio signal strength of the radio device. an acquisition unit configured to acquire first information as information for obtaining one or more state variables, characterized in that : the first information is related to something between a radio device (M1) and another radio device (M2); and the machine learning apparatus further comprises a learning unit configured to learn the one or more state variables and a radio wave propagation state in association with each other, the radio wave propagation state being at least one of amount of radio wave attenuation between the radio device and the other radio device, minimum transmission radio wave strength of the radio device that can be received by the other radio device, received radio wave strength of the other radio device relative to the transmission from the radio device at a predetermined transmission radio wave strength, and ratio of received radio signal strength in the other radio device to the transmitted radio signal strength of the radio device. the first information is related to something between a radio device (M1) and another radio device (M2); and the machine learning apparatus further comprises a learning unit configured to learn the one or more state variables and a radio wave propagation state in association with each other, the radio wave propagation state being at least one of amount of radio wave attenuation between the radio device and the other radio device, minimum transmission radio wave strength of the radio device that can be received by the other radio device, received radio wave strength of the other radio device relative to the transmission from the radio device at a predetermined transmission radio wave strength, and ratio of received radio signal strength in the other radio device to the transmitted radio signal strength of the radio device. amount of radio wave attenuation between the radio device and the other radio device, minimum transmission radio wave strength of the radio device that can be received by the other radio device, received radio wave strength of the other radio device relative to the transmission from the radio device at a predetermined transmission radio wave strength, and ratio of received radio signal strength in the other radio device to the transmitted radio signal strength of the radio device. <EOS>