An integrated data accessing system having control apparatus for multi-directional data transmission is described. The integrated data accessing system includes a control apparatus, a plurality of communication interface engines. The control apparatus includes a plurality of bi-directional transmission modules, a control unit, a multi-directional transferring engine, and a memory unit. The control unit detects a source storage and a target storage. The multi-directional transferring engine selectively transfers the data content among storage units. The multi-directional transferring engine includes a first switch module, a second switch module, and a data buffer. The first switch module switches to the first bi-directional transmission module to select the source storage. The second switch module switches to the second bi-directional transmission module to select the target storage. The data buffer stores the data content transmitted from the source storage and the target storage. The multi-directional transferring engine transfers the data content in the source storage via the first bi-directional transmission module to the target storage via the second bi-directional transmission module when the control unit triggers the first switch module and the switch second module.