Multi-chip capable of ensuring each operation of embedded chips

PURPOSE: A multi-chip is provided to operate performance of each embedded chip sufficiently by removing tloss of a conventional memory system embed with a multi-chip. CONSTITUTION: According to the multi-chip(300) having a number of chips within, the first chip(302) is enabled by the first chip selection signal(CE1) and informs its own state by the first ready/busy signal(Ready/Busy1). The second chip(304) is enabled by the second chip selection signal(CE2) and informs its own state by the second ready/busy signal(Ready/Busy2). Control signals are connected to the first chip and the second chip for inter-operation with an external host(310). The third chip is enabled by the first chip selection signal and informs its own state by the first ready/busy signal and is connected with the first chip in parallel. And the fourth chip is enabled by the second chip selection signal and informs its own state by the second ready/busy signal and is connected with the second chip in parallel.