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Recently, the number of senior citizens who are living alone and taking medicine has been increasing due to population aging. Since they have many risks of incorrect dosing and their caretakers are concerned about their health, we propose iMec System which is composed of iMec (interactive medicine case), Ubiquitous Sensors, and iMec Server. The system assists caretakers in monitoring the dosing condition via web browser. And Moreover, the system send email to caretakers in order to notify sings of incorrect dosing. The iMec, which is a medicine case developed by us, recognizes medicines in it using camera to confirm the quantity of dosing (e.g. take 3 tablets). The Ubiquitous Sensors, which are sensors embedded in house, assists the iMec in estimating the living state of senior citizens in order to confirm the timing of dosing (e.g. after eating breakfast). The iMec Server accumulates the dosing condition of senior citizens periodically. We confirmed that iMec was able to recognize the 3 kinds of medicines by experiments and iMec System was able to estimate the 7 living states by simulations.