A labor of disconnecting many cables is omitted even when carrying a file basestation with an external storage loaded together with a main body. An information processing unit comprises: a main body having a CPU, a keyboard and a display unit; a file basestation with an external storage, such as an FD.cndot.D or a CD ROM.cndot.D, loaded; and a portreplicator with many connectors loaded. Removal of the main body alone from the portreplicator can omit the labor of disconnecting many cables connected to the portreplicator.