To obtain a node having provision for bus manager function automatic changeover that has a function of a USB bus manager and a function of a USB bus slave in common and to obtain a mobile terminal and a mobile terminal system.

A bus manager 62 acts like a sub bus manager when a main bus manager is not in operation. The bus manager 62 is not completely disconnected from the main bus manager but has some relations thereto, and acts like the sub bus manager. When the main bus manager is in operation, the bus manager 62 acts like a bus peripheral and the bus manager 62 acts like the bus manager 62 itself when not connected to the main bus manager. Thus, both the bus managers act like their own functions while interfering with each other.