The invention relates to a home-automation system and a method for constituting the topology of a home-automation system comprising a plurality of central control units, the method being executed by a user terminal (T) connected to the at least one home-automation system and comprising the following steps: receiving (ECTT3, ECTT4) from at least one central control unit (U1, U2) among the plurality of central control units (U1, U2) at least one message (MDL1, MDL2) comprising a list (DL1, DL2) comprising at least one home-automation device with which said central control unit is capable of communicating; selecting (ECTT6) at least one combination of at least one device in connection with one central control unit among the plurality of control units (U1, U2) for which the communicated device list (DL) comprises the selected device, with a view to connecting at least one device to said central control unit; and sending (ECTT7) a connection message (MR) to the at least one central control unit (U) selected in step ii so as to trigger a connection of the at least one device (D) to said central control unit (U).