An information processing apparatus connected to a network via a network interface device and capable of performing encrypted communication with an external apparatus on the network. When the information processing apparatus is operating in a normal power mode, a sleep control module thereof detects whether a condition under which the apparatus shifts to an energy saving mode in which power consumption is smaller than in the normal power mode is satisfied. When the condition is detected to be satisfied, a proxy response registration module of the apparatus instructs an IPSec module of the same to request the external apparatus not to perform encrypted communication.