An intercom system comprising: a dwelling parent device installed in each dwelling; a collective foyer device (10A-10C) configured to communicate with the dwelling parent device, and a control device configured to control the collective foyer device (10A-10C), wherein the collective foyer device (10A-10C) comprises one or several calling units (101, 121), each calling unit having: a plurality of dwelling information display units on each of which dwelling information associated with dwelling parent devices ID used for specifying a dwelling parent device associated with a resident is displayed so as for a visitor to call the resident, and a plurality of dedicated input receiving units correlated with the dwelling information display units and capable of receiving an operation for calling the dwelling parent device corresponding to the dwelling information displayed on each dwelling information, wherein each calling unit (101, 121) is configured so that a decorative panel can be attached on a front surface thereof so as to cover one or several of the plurality of dwelling information display units and the correlated dedicated input receiving units, wherein the collective foyer device (10A-10C) or the control device comprises a calling table in which location numbers for specifying locations of the plurality of dedicated input receiving units in a predetermined region of the collective foyer device (10A-10C) are assigned, and wherein the intercom system is configured such that the respective dwelling information is assigned, on the calling table, to the location numbers corresponding to at least one dedicated input receiving unit, among the plurality of dedicated input receiving units, which is not covered by a decorative panel, and wherein the intercom system is further configured such that the respective dwelling information is not assigned, on the calling table, to the location numbers corresponding to at least one dedicated input receiving unit which is covered by a decorative panel. a dwelling parent device installed in each dwelling; a collective foyer device (10A-10C) configured to communicate with the dwelling parent device, and a control device configured to control the collective foyer device (10A-10C), wherein the collective foyer device (10A-10C) comprises one or several calling units (101, 121), each calling unit having: a plurality of dwelling information display units on each of which dwelling information associated with dwelling parent devices ID used for specifying a dwelling parent device associated with a resident is displayed so as for a visitor to call the resident, and a plurality of dedicated input receiving units correlated with the dwelling information display units and capable of receiving an operation for calling the dwelling parent device corresponding to the dwelling information displayed on each dwelling information, a plurality of dwelling information display units on each of which dwelling information associated with dwelling parent devices ID used for specifying a dwelling parent device associated with a resident is displayed so as for a visitor to call the resident, and a plurality of dedicated input receiving units correlated with the dwelling information display units and capable of receiving an operation for calling the dwelling parent device corresponding to the dwelling information displayed on each dwelling information, wherein each calling unit (101, 121) is configured so that a decorative panel can be attached on a front surface thereof so as to cover one or several of the plurality of dwelling information display units and the correlated dedicated input receiving units, wherein the collective foyer device (10A-10C) or the control device comprises a calling table in which location numbers for specifying locations of the plurality of dedicated input receiving units in a predetermined region of the collective foyer device (10A-10C) are assigned, and wherein the intercom system is configured such that the respective dwelling information is assigned, on the calling table, to the location numbers corresponding to at least one dedicated input receiving unit, among the plurality of dedicated input receiving units, which is not covered by a decorative panel, and wherein the intercom system is further configured such that the respective dwelling information is not assigned, on the calling table, to the location numbers corresponding to at least one dedicated input receiving unit which is covered by a decorative panel.