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We have monitored the BL Lacertae object S5 0716+714 simultaneously in the B,R and I bands on three nights in November 2014. The average time resolution isquite high (73s, 34s, 58s for the filters B, R and I), which can help us tracethe profile of the variation and search for the short inter-band time delay.Intra-day variability was about 0.1 mag on the first two nights and more than0.3 mag on the third. A bluer-when-brighter color behavior was found. An clearloop path can be seen on the color-magnitude diagram of the third night,revealing possible time delays between variations at high and low energies. Itis the first time that the intra-day spectral hysteresis loop has been found soobviously in the optical band. We used the interpolated cross-correlationfunction method to further confirm the time delay and calculated the values oflag between light curves at different wavelengths on each night. On the thirdnight, variations in the R and B bands is approximately 1.5 minutes laggingbehind the I band. Such optical time delay is probably due to the interplay ofdifferent processes of electrons in the jet of the blazar.

Simultaneous optical monitoring of BL Lacertae object S5 0716+714 with high temporal resolution