An image processing apparatus being configured to support a power-saving mode which allows achieving low power consumption while keeping an idle connection without communication between the image processing apparatus and a communication device in a network environment, comprises: a first judgment portion which judges whether or not the communication device supports the power-saving mode; and a communicator which establishes a connection to the communication device at a first communication rate if the first judgment portion judges that the communication device does not support the power-saving mode, at a second communication rate which is faster than the first communication rate if the first judgment portion judges that the communication device supports the power-saving mode.