A wireless communication apparatus which is arranged to wirelessly communicate with a plurality of wireless communicators, wherein one of the wireless communicators is coupled to a first microphone and another one of the wireless communicators is coupled to a second microphone, comprising: an audio processor which is arranged to acquire audio data from the first microphone and to acquire audio data from the second microphone; a controller which is arranged to detect a first instruction for recording the audio data, when the controller detects an occurrence of a defined event, wherein the defined event is an operation of a first actuator (213, 214) of the wireless communicator coupled to the first microphone; an audio recorder which is arranged to start recording the audio data from the first microphone acquired by the audio processor according to the first instruction for audio recording and to stop the recording after a defined period of time since detection of the first instruction for audio recording; and a memory controller which is arranged to create a recorded audio file including the audio data recorded by the audio recorder, the recorded audio file being linked to log information of communication between the wireless communication apparatus and the first microphone, wherein the wireless communication apparatus is arranged for outputting audio data acquired from the first microphone to a speaker of an order post; the wireless communication apparatus is arranged to communicate audio data acquired from a microphone of the order post at least to the wireless communicator coupled to the first microphone, wherein the audio recorder is arranged to record the audio data from the microphone of the order post together with the audio data from the first microphone; wherein the wireless communication apparatus is arranged for communicating audio data acquired from the second microphone to the other wireless communicators of the plurality of wireless communicators when the controller detects the operation of a page button of the wireless communicator coupled to the second microphone. an audio processor which is arranged to acquire audio data from the first microphone and to acquire audio data from the second microphone; a controller which is arranged to detect a first instruction for recording the audio data, when the controller detects an occurrence of a defined event, wherein the defined event is an operation of a first actuator (213, 214) of the wireless communicator coupled to the first microphone; an audio recorder which is arranged to start recording the audio data from the first microphone acquired by the audio processor according to the first instruction for audio recording and to stop the recording after a defined period of time since detection of the first instruction for audio recording; and a memory controller which is arranged to create a recorded audio file including the audio data recorded by the audio recorder, the recorded audio file being linked to log information of communication between the wireless communication apparatus and the first microphone, wherein the wireless communication apparatus is arranged for outputting audio data acquired from the first microphone to a speaker of an order post; the wireless communication apparatus is arranged to communicate audio data acquired from a microphone of the order post at least to the wireless communicator coupled to the first microphone, wherein the audio recorder is arranged to record the audio data from the microphone of the order post together with the audio data from the first microphone; wherein the wireless communication apparatus is arranged for communicating audio data acquired from the second microphone to the other wireless communicators of the plurality of wireless communicators when the controller detects the operation of a page button of the wireless communicator coupled to the second microphone.