The present disclosure relates to a piece of network access apparatus for indoor environment monitoring and a method for indoor environment monitoring of the network access apparatus. The present disclosure also relates to a network access apparatus for indoor environment monitoring and a method for indoor environment monitoring of the network access apparatus so that network access apparatus installed indoors (e.g. in the house, in the office, in a building) additionally take an action of monitoring indoor environment. The network access apparatus includes a network connection performer to support at least a communication terminal's connection to an external network, relay a data communication between the communication terminal and the external network, and obtain and provide information on a history of network connections per communication terminal, an indoor environment monitoring unit to sense and inform indoor environment via a plurality of indoor environment sensors, infer a user situation based on the history of network connections per communication terminal, and control each sensing cycle of the plurality of indoor environment sensors based on the user situation, and a power supplier to generate and provide an operating power of the network connection performer and the indoor environment monitoring unit.