A communication system comprising: a plurality of communication equipments (20a, 20b); and a server equipment communicatively connected to each of said plurality of communication equipments, wherein each of said plurality of communication equipments comprises: a communication port to which a communication cable (MCa) is connected in a detachable manner; a connection notification transmitting unit configured to transmit, to said server equipment, communication port identification information for identifying said communication port to which said communication cable is connected; and a first notification unit configured to indicate, in a viewable manner, a communication port corresponding to a first notification instruction received from said server equipment as a communication port to which the communication cable is required to be connected, wherein said server equipment comprises: a connection configuration information storage unit configured to store connection configuration information indicating a correspondence relationship between a pair of communication ports expected to be connected with each other through said communication cable and a connection status of said pair of communication ports and said communication cable; and a first notification instruction transmitting unit configured to refer to said connection configuration information corresponding to said communication port identification information received from any of said plurality of communication equipments, and to transmit, if another communication port of said pair of communication ports other than the communication port corresponding to said communication port identification information is not yet connected to said communication cable, said first notification instruction for identifying said another communication port to a communication equipment having said another communication port. a plurality of communication equipments (20a, 20b); and a server equipment communicatively connected to each of said plurality of communication equipments, wherein each of said plurality of communication equipments comprises: a communication port to which a communication cable (MCa) is connected in a detachable manner; a connection notification transmitting unit configured to transmit, to said server equipment, communication port identification information for identifying said communication port to which said communication cable is connected; and a first notification unit configured to indicate, in a viewable manner, a communication port corresponding to a first notification instruction received from said server equipment as a communication port to which the communication cable is required to be connected, a communication port to which a communication cable (MCa) is connected in a detachable manner; a connection notification transmitting unit configured to transmit, to said server equipment, communication port identification information for identifying said communication port to which said communication cable is connected; and a first notification unit configured to indicate, in a viewable manner, a communication port corresponding to a first notification instruction received from said server equipment as a communication port to which the communication cable is required to be connected, wherein said server equipment comprises: a connection configuration information storage unit configured to store connection configuration information indicating a correspondence relationship between a pair of communication ports expected to be connected with each other through said communication cable and a connection status of said pair of communication ports and said communication cable; and a first notification instruction transmitting unit configured to refer to said connection configuration information corresponding to said communication port identification information received from any of said plurality of communication equipments, and to transmit, if another communication port of said pair of communication ports other than the communication port corresponding to said communication port identification information is not yet connected to said communication cable, said first notification instruction for identifying said another communication port to a communication equipment having said another communication port. a connection configuration information storage unit configured to store connection configuration information indicating a correspondence relationship between a pair of communication ports expected to be connected with each other through said communication cable and a connection status of said pair of communication ports and said communication cable; and a first notification instruction transmitting unit configured to refer to said connection configuration information corresponding to said communication port identification information received from any of said plurality of communication equipments, and to transmit, if another communication port of said pair of communication ports other than the communication port corresponding to said communication port identification information is not yet connected to said communication cable, said first notification instruction for identifying said another communication port to a communication equipment having said another communication port.