A portable light-emitting apparatus comprising: a light emitting portion; a near-field wireless communication unit configured to transmit and receive a signal which represents a light emission mode to and from another portable light-emitting apparatus of the same type, wherein the light emission mode defines a specific light emission of the light emitting portion of a respective portable light-emitting apparatus; a memory configured to store the light emission mode received via the near-field wireless communication unit, characterized in that the portable light-emitting apparatus further comprises a sensor configured to detect a movement of the portable light-emitting apparatus and to detect that the portable light-emitting apparatus has touched another portable light-emitting apparatus, an action detecting unit including: a first detecting unit that is configured to output a switching instruction to a switching unit when the sensor detects that another portable light-emitting apparatus has been touched, and a second detecting unit that is configured to, when the sensor detects a movement of the portable light-emitting apparatus, output a switching instruction to the switching unit; the switching unit which is configured to control the light-emitting portion by setting the light emission mode stored in the memory as an active light emission mode in response to the switching instruction outputted from the first detecting unit and/or the second detecting unit, wherein the switching unit is further configured to control the light-emitting portion by setting the light emission mode stored in the memory as an active light emission mode in response to a command including a switching instruction received from another portable light-emitting apparatus via the near-field wireless communication unit, and wherein the switching unit is further configured, when controlling the light-emitting portion by setting the light emission mode stored in the memory as an active light emission mode, to start a transmission of the light emission mode stored in the memory to another portable light-emitting apparatus via the near-field wireless communication unit. a light emitting portion; a near-field wireless communication unit configured to transmit and receive a signal which represents a light emission mode to and from another portable light-emitting apparatus of the same type, wherein the light emission mode defines a specific light emission of the light emitting portion of a respective portable light-emitting apparatus; a memory configured to store the light emission mode received via the near-field wireless communication unit, characterized in that the portable light-emitting apparatus further comprises a sensor configured to detect a movement of the portable light-emitting apparatus and to detect that the portable light-emitting apparatus has touched another portable light-emitting apparatus, an action detecting unit including: a first detecting unit that is configured to output a switching instruction to a switching unit when the sensor detects that another portable light-emitting apparatus has been touched, and a second detecting unit that is configured to, when the sensor detects a movement of the portable light-emitting apparatus, output a switching instruction to the switching unit; a first detecting unit that is configured to output a switching instruction to a switching unit when the sensor detects that another portable light-emitting apparatus has been touched, and a second detecting unit that is configured to, when the sensor detects a movement of the portable light-emitting apparatus, output a switching instruction to the switching unit; the switching unit which is configured to control the light-emitting portion by setting the light emission mode stored in the memory as an active light emission mode in response to the switching instruction outputted from the first detecting unit and/or the second detecting unit, wherein the switching unit is further configured to control the light-emitting portion by setting the light emission mode stored in the memory as an active light emission mode in response to a command including a switching instruction received from another portable light-emitting apparatus via the near-field wireless communication unit, and