An information processing system (100, 200) comprising a sensor device and an imaging device, the sensor device comprising a vibration sensor configured to acquire a vibration waveform indicating a behavior of a user; a preprocessing unit configured to determine whether a measurement value of the vibration waveform detected by the sensor is equal to or greater than a predetermined threshold value, and, a communication unit configured to transmit, when it is determined that the measurement value is equal to or greater than the predetermined threshold value, the vibration waveform to the imaging device, and, when it is determined that the measurement value is not equal to or greater than the predetermined threshold value, not to transmit the vibration waveform to the imaging device; the imaging device comprising a communication unit configured to receive the vibration waveform related to the behavior of a user from the sensor device; an analyzing unit configured to detect the occurrence of a play event of multiple play events defined in advance by analyzing the vibration waveform through pattern recognition, the multiple play events defined in advance comprising a first group of predefined play events and a second group of predefined play events;to generate play event information comprising a start time and an end time of the detected play event based on a determination whether detected behavior of the user is a predetermined play event; and to determine if the detected play event belongs to the first group of predefined play events or to the second group of predefined play events; an imaging control unit configured to, when it is determined that the detected play event belongs to the first group of predefined play events, to control an imaging unit to start capturing play images from the start time of the detected play event and to stop capturing play images at the end time of the detected play event; and when it is determined that the detected play event belongs to the second group of predefined play events, to not control the imaging unit to capture play images related to the detected play event. a vibration sensor configured to acquire a vibration waveform indicating a behavior of a user; a preprocessing unit configured to determine whether a measurement value of the vibration waveform detected by the sensor is equal to or greater than a predetermined threshold value, and, a communication unit configured to transmit, when it is determined that the measurement value is equal to or greater than the predetermined threshold value, the vibration waveform to the imaging device, and, when it is determined that the measurement value is not equal to or greater than the predetermined threshold value, not to transmit the vibration waveform to the imaging device; a communication unit configured to receive the vibration waveform related to the behavior of a user from the sensor device; an analyzing unit configured to detect the occurrence of a play event of multiple play events defined in advance by analyzing the vibration waveform through pattern recognition, the multiple play events defined in advance comprising a first group of predefined play events and a second group of predefined play events;to generate play event information comprising a start time and an end time of the detected play event based on a determination whether detected behavior of the user is a predetermined play event; and to determine if the detected play event belongs to the first group of predefined play events or to the second group of predefined play events; an imaging control unit configured to, when it is determined that the detected play event belongs to the first group of predefined play events, to control an imaging unit to start capturing play images from the start time of the detected play event and to stop capturing play images at the end time of the detected play event; and when it is determined that the detected play event belongs to the second group of predefined play events, to not control the imaging unit to capture play images related to the detected play event.