A method for providing a call service performed by a network exchange device, comprising: receiving a call request message from a calling user, wherein the call request message carries a service operation code and at least two called numbers; determining a connection manner of the call according to the service operation code carried in the call request message; and connecting, according to the determined connection manner, to called users corresponding to the called numbers carried in the call request message, wherein the determining a connection manner of the call according to the service operation code carried in the call request message comprises: determining a service type of the call being a multi-user call service type being a type indicating that a call is sent to the at least two called numbers carried in the call request message according to the service operation code carried in the call request message; and in a first alternative determining the connection manner of the call according to the determined service type and/or presetting or in a second alternative determining the connection manner of the call directly according to the service operation code, wherein the connection manner comprises: concurrently connecting to the called users corresponding to the at least two called numbers carried in the call request message; or connecting, in turn according to a specified sequence, to the called users corresponding to the at least two called numbers carried in the call request message, wherein in case the service operation code only contains the service type, determining an execution of the first alternative and in case the service operation code contains the service type and a symbol indicating the connection manner, determining an execution of the second alternative instead of the first alternative. receiving a call request message from a calling user, wherein the call request message carries a service operation code and at least two called numbers; determining a connection manner of the call according to the service operation code carried in the call request message; and connecting, according to the determined connection manner, to called users corresponding to the called numbers carried in the call request message, wherein the determining a connection manner of the call according to the service operation code carried in the call request message comprises: determining a service type of the call being a multi-user call service type being a type indicating that a call is sent to the at least two called numbers carried in the call request message according to the service operation code carried in the call request message; and in a first alternative determining the connection manner of the call according to the determined service type and/or presetting or in a second alternative determining the connection manner of the call directly according to the service operation code, wherein the connection manner comprises: concurrently connecting to the called users corresponding to the at least two called numbers carried in the call request message; or connecting, in turn according to a specified sequence, to the called users corresponding to the at least two called numbers carried in the call request message, wherein in case the service operation code only contains the service type, determining an execution of the first alternative and in case the service operation code contains the service type and a symbol indicating the connection manner, determining an execution of the second alternative instead of the first alternative. determining a service type of the call being a multi-user call service type being a type indicating that a call is sent to the at least two called numbers carried in the call request message according to the service operation code carried in the call request message; and in a first alternative determining the connection manner of the call according to the determined service type and/or presetting or in a second alternative determining the connection manner of the call directly according to the service operation code, wherein the connection manner comprises: concurrently connecting to the called users corresponding to the at least two called numbers carried in the call request message; or connecting, in turn according to a specified sequence, to the called users corresponding to the at least two called numbers carried in the call request message, wherein in case the service operation code only contains the service type, determining an execution of the first alternative and in case the service operation code contains the service type and a symbol indicating the connection manner, determining an execution of the second alternative instead of the first alternative. concurrently connecting to the called users corresponding to the at least two called numbers carried in the call request message; or connecting, in turn according to a specified sequence, to the called users corresponding to the at least two called numbers carried in the call request message, wherein in case the service operation code only contains the service type, determining an execution of the first alternative and in case the service operation code contains the service type and a symbol indicating the connection manner, determining an execution of the second alternative instead of the first alternative.