Semiconductor integrated device

In one embodiment, a semiconductor integrated device includes a plurality of semiconductor chips each having a first internal circuit and a second internal circuit and being stacked while displaced from each other. The first internal circuit processes a data signal in accordance with a predetermined process. The second internal circuit receives a request signal from a transmission source and determines whether the request signal is a request to itself or not. When the request signal is the request to the second internal circuit itself, the second internal circuit receives a data signal from a transmission source and outputs the data signal to the first internal circuit. When the request signal is not the request to the second internal circuit itself, the second internal circuit transfers the request signal to a transfer destination, receives the data signal from the transmission source and transfers the data signal to the transfer destination.