The present invention relates to a management system for in-house power consumption, more particularly to a management system for in-house power consumption efficiently performing in-house power consumption by means of estimating power consumption of each operation of in-house electric devices. The present invention provides a management system for in-house power consumption comprising: at least one or more electric devices (30, 40, 50, 60) which comprise a communication means and transmit current operation information via the communication means on a given network; an power sensor module (20) that measures an instantaneous power consumption of the total electric devices and transmit it on the network; and a power consumption controller (70) that saves a previously received the operation information and the instantaneous power consumption and estimates the power consumption of each electric device (30, 40, 50, 60) on the basis of the saved operation information and instantaneous power consumption and the currently received operation information and instantaneous power consumption.