An audio device which is configured to receive audio data (Da) from another device, comprising: a memory which stores instructions, a clock which has common time information with said another device, and a processor that is configured to execute the instructions stored in the memory, wherein the memory stores pulse data (Dp), the pulse data (Dp) including a pulse provided at a start time (Td), the pulse data having a predetermined duration (Tp) in time from the start time (Td) to an end time (Td+Tp), the processor is configured to execute the instructions stored in the memory to: receive the audio data (Da) and a time stamp (Ts) attached to the audio data (Da), the time stamp (Ts) being a time when said another device starts outputting the audio data (Da), output the pulse data (Dp), the pulse data (Dp) being output when the audio device receives the audio data (Da), detect the start time (Td) of the pulse data (Dp) by referring to the clock, calculate the end time (Td+Tp) of the pulse data (Dp) by adding the predetermined duration (Tp) to the start time (Td), compare the end time (Td+Tp) of the pulse data (Dp) and the time stamp (Ts), adjust the audio data (Da) based on the comparing result, and output the adjusted audio data (Da), the adjusted audio data (Da) being output after the pulse data (Dp) is output, wherein the memory stores silent audio data (Ds), and when the time stamp (Ts) is later than the end time (Td+Tp) of the pulse data (Dp), the processor is configured to (i) output the silent audio data (Ds) for a period corresponding to a difference between the time stamp (Ts) and the end time (Td+Tp) of the pulse data (Dp), and (ii) output the audio data (Da) after the silent audio data (Ds) is output; when the time stamp (Ts) is earlier than the end time (Td+Tp) of the pulse data (Dp), the processor is configured to (i) adjust the audio data (Da) by cutting the audio data (Da) for an amount corresponding to a difference between the time stamp (Ts) and the end time (Td+Tp) of the pulse data (Dp), and (ii) output the adjusted audio data (Da). a memory which stores instructions, a clock which has common time information with said another device, and a processor that is configured to execute the instructions stored in the memory, wherein the memory stores pulse data (Dp), the pulse data (Dp) including a pulse provided at a start time (Td), the pulse data having a predetermined duration (Tp) in time from the start time (Td) to an end time (Td+Tp), the processor is configured to execute the instructions stored in the memory to: receive the audio data (Da) and a time stamp (Ts) attached to the audio data (Da), the time stamp (Ts) being a time when said another device starts outputting the audio data (Da), output the pulse data (Dp), the pulse data (Dp) being output when the audio device receives the audio data (Da), detect the start time (Td) of the pulse data (Dp) by referring to the clock, calculate the end time (Td+Tp) of the pulse data (Dp) by adding the predetermined duration (Tp) to the start time (Td), compare the end time (Td+Tp) of the pulse data (Dp) and the time stamp (Ts), adjust the audio data (Da) based on the comparing result, and output the adjusted audio data (Da), the adjusted audio data (Da) being output after the pulse data (Dp) is output, wherein the memory stores silent audio data (Ds), and when the time stamp (Ts) is later than the end time (Td+Tp) of the pulse data (Dp), the processor is configured to (i) output the silent audio data (Ds) for a period corresponding to a difference between the time stamp (Ts) and the end time (Td+Tp) of the pulse data (Dp), and (ii) output the audio data (Da) after the silent audio data (Ds) is output; when the time stamp (Ts) is earlier than the end time (Td+Tp) of the pulse data (Dp), the processor is configured to (i) adjust the audio data (Da) by cutting the audio data (Da) for an amount corresponding to a difference between the time stamp (Ts) and the end time (Td+Tp) of the pulse data (Dp), and (ii) output the adjusted audio data (Da). receive the audio data (Da) and a time stamp (Ts) attached to the audio data (Da), the time stamp (Ts) being a time when said another device starts outputting the audio data (Da), output the pulse data (Dp), the pulse data (Dp) being output when the audio device receives the audio data (Da), detect the start time (Td) of the pulse data (Dp) by referring to the clock, calculate the end time (Td+Tp) of the pulse data (Dp) by adding the predetermined duration (Tp) to the start time (Td), compare the end time (Td+Tp) of the pulse data (Dp) and the time stamp (Ts), adjust the audio data (Da) based on the comparing result, and output the adjusted audio data (Da), the adjusted audio data (Da) being output after the pulse data (Dp) is output, wherein the memory stores silent audio data (Ds), and when the time stamp (Ts) is later than the end time (Td+Tp) of the pulse data (Dp), the processor is configured to (i) output the silent audio data (Ds) for a period corresponding to a difference between the time stamp (Ts) and the end time (Td+Tp) of the pulse data (Dp), and (ii) output the audio data (Da) after the silent audio data (Ds) is output; when the time stamp (Ts) is earlier than the end time (Td+Tp) of the pulse data (Dp), the processor is configured to (i) adjust the audio data (Da) by cutting the audio data (Da) for an amount corresponding to a difference between the time stamp (Ts) and the end time (Td+Tp) of the pulse data (Dp), and (ii) output the adjusted audio data (Da).