A storage system connected to a host computer via a channel, the storage system comprising: plural protocol processors connected to the channel for transmitting and receiving a frame to and from the host computer; plural processors for controlling the channel; a local router connected to one protocol processor and to plural processors; a first memory connected to the local router; and a disk drive which provides a storage area for storing data which is required to be written by the host computer, wherein: the protocol processor transmits, upon transmitting the frame to the host computer, information on a transmission state of the transmitted frame to the local router; the local router determines, upon the protocol processor receiving the frame, which of the processors processes the received frame, based on the storage area to which the received frame requests for an access; the local router transfers the received frame to the determined processor; the local router determines, upon the protocol processor transmitting the frame, which of the processors processes the information on the transmission state of the frame, based on an exchange of the transmitted frames including several sequences carried out by means of a plurality of frames transmitted from the protocol processor; and the local router transfers the information on the transmission state of the transmitted frame to the determined processor. plural protocol processors connected to the channel for transmitting and receiving a frame to and from the host computer; plural processors for controlling the channel; a local router connected to one protocol processor and to plural processors; a first memory connected to the local router; and a disk drive which provides a storage area for storing data which is required to be written by the host computer, wherein: the protocol processor transmits, upon transmitting the frame to the host computer, information on a transmission state of the transmitted frame to the local router; the local router determines, upon the protocol processor receiving the frame, which of the processors processes the received frame, based on the storage area to which the received frame requests for an access; the local router transfers the received frame to the determined processor; the local router determines, upon the protocol processor transmitting the frame, which of the processors processes the information on the transmission state of the frame, based on an exchange of the transmitted frames including several sequences carried out by means of a plurality of frames transmitted from the protocol processor; and the local router transfers the information on the transmission state of the transmitted frame to the determined processor. the protocol processor transmits, upon transmitting the frame to the host computer, information on a transmission state of the transmitted frame to the local router; the local router determines, upon the protocol processor receiving the frame, which of the processors processes the received frame, based on the storage area to which the received frame requests for an access; the local router transfers the received frame to the determined processor; the local router determines, upon the protocol processor transmitting the frame, which of the processors processes the information on the transmission state of the frame, based on an exchange of the transmitted frames including several sequences carried out by means of a plurality of frames transmitted from the protocol processor; and the local router transfers the information on the transmission state of the transmitted frame to the determined processor.