An apparatus and a method for measuring the efficiency of a system-on-a-chip (SoC). The SoC efficiency measuring apparatus includes a storage to store information about each of intellectual properties (IP) embedded on the SoC, a receipt efficiency calculator to set an IP corresponding to information stored in the storage as a source IP and to calculate a receipt efficiency from the source IP based on the information about the source IP, a transmission efficiency calculator to set an IP corresponding to information stored in the storage as an object IP and to calculate a transmission efficiency to the object IP based on the information about the object IP, and a displayer to display the efficiencies calculated by the receipt efficiency calculator and the transmission efficiency calculator. Accordingly, the efficiency of the SoC can be measured before manufacturing.