A recording method, comprising: acquiring and recording, by a recording unit of each of a plurality of portable terminals (12,..., 12), a piece of acoustic data (XA,..., XA) representing a sound from within an acoustic space of each of the plurality of portable terminal devices (12,..., 12); editing, by an editing unit of each of the plurality of portable terminals (12,..., 12), the respective piece of recorded acoustic data (XA,..., XA) to generate a piece of edited acoustic data (XB,..., XB), the editing being a post-recording processing when the recording of the sound is stopped; acquiring, by an acoustic processing device, the pieces of edited acoustic data (XB,..., XB) from the plurality of portable terminal devices (12,..., 12), respectively; synchronizing, by an acoustic processing unit in the acoustic processing device, the pieces of edited acoustic data (XB,..., XB), respectively; mixing, by the acoustic processing unit in the acoustic processing device, the pieces of edited acoustic data (XB,..., XB) for which the synchronizing has been executed; wherein each of plurality of portable terminal devices (12,..., 12) is configured to perform short-range wireless communications to/from all other of the plurality of portable terminal devices (12,..., 12); and the editing comprises editing the piece of recorded acoustic data (XA,..., XA) by using management information acquired from all other of the plurality of portable terminal devices (12,..., 12) through the short-range wireless communications, the management information including terminal identification information, sound recording status information specifying a volume of the pieces of acoustic data, and control variable information specifying a numerical value of a control variable being a sound recording level of the pieces of acoustic data, said editing being performed by adjusting an amplitude of the respective piece of recorded acoustic data based on the control variable information by using a mean value of the respective control variables. acquiring and recording, by a recording unit of each of a plurality of portable terminals (12,..., 12), a piece of acoustic data (XA,..., XA) representing a sound from within an acoustic space of each of the plurality of portable terminal devices (12,..., 12); editing, by an editing unit of each of the plurality of portable terminals (12,..., 12), the respective piece of recorded acoustic data (XA,..., XA) to generate a piece of edited acoustic data (XB,..., XB), the editing being a post-recording processing when the recording of the sound is stopped; acquiring, by an acoustic processing device, the pieces of edited acoustic data (XB,..., XB) from the plurality of portable terminal devices (12,..., 12), respectively; synchronizing, by an acoustic processing unit in the acoustic processing device, the pieces of edited acoustic data (XB,..., XB), respectively; mixing, by the acoustic processing unit in the acoustic processing device, the pieces of edited acoustic data (XB,..., XB) for which the synchronizing has been executed; wherein each of plurality of portable terminal devices (12,..., 12) is configured to perform short-range wireless communications to/from all other of the plurality of portable terminal devices (12,..., 12); and the editing comprises editing the piece of recorded acoustic data (XA,..., XA) by using management information acquired from all other of the plurality of portable terminal devices (12,..., 12) through the short-range wireless communications, the management information including terminal identification information, sound recording status information specifying a volume of the pieces of acoustic data, and control variable information specifying a numerical value of a control variable being a sound recording level of the pieces of acoustic data, said editing being performed by adjusting an amplitude of the respective piece of recorded acoustic data based on the control variable information by using a mean value of the respective control variables.