The invention provides a caller ID recognition device and a client management method and system, relating to the field of client relation management. The client management method comprises the following steps: a caller ID recognition device acquires a call incoming request received by a public telephone network, wherein the call incoming request comprises encoding information of a caller ID; the caller ID recognition device is used for decoding the encoding information of the caller ID to obtain the caller ID; the caller ID recognition device transmits the acquired caller ID to a user terminal provided with a client side; a cloud computation device searches corresponding client information from data subjected to distributed storage according to the caller ID sent from the client side; the cloud computation device sends client information corresponding to the acquired caller ID to the client side, wherein the client side is arranged on the user terminal; and when the client information corresponding to the caller ID is not searched, the cloud computation device sends prompt information. The caller ID recognition device and the client management method and system can provide better service for business users by fusing a communication function to client management and sufficiently utilizing the client information.