A communication apparatus is provided. The communication apparatus includes a first antenna configured to transmit and receive at least one of a signal of a first communication network and a signal of a second communication network, a second antenna configured to receive one of the signal of the first communication network and the signal of the second communication network, a first diplexer connected to the first antenna to separate the signal that is received through the first antenna into a high-band signal and a low-band signal based on a specific frequency and to output the separated signals, and a signal control unit configured to change communication paths of the high-band signal, the low-band signal, and the signal that is received through the second antenna according to a combination of frequency bands supported in a network.