It is possible to accurately convey information relevant to a long period ground motion to a person staying on each floor of a building. A system 1 for communicating information relating to a long period ground motion acquires information indicating a floor on which a user stays in a building at which the user stays, information relevant to a position and a structure of the building, and information relevant to a state of an earthquake that occurs, and calculates a state of shaking that occurs on the floor of the building at which the user stays due to the long period ground motion to be communicated to the user through a user terminal 3, and thus, information relevant to the long period ground motion can be obtained through the user terminal 3 that the user has.